SEA/Ophthal/126 Distribution : Limited

Guidelines for the Management of at

Primary, Secondary & Tertiary Care health facilities in the South-East Asia Region

World Health Organization Regional Office for South-East Asia 2004

Contents

1. Foreword 2. About the Publication 3. Guidelines for Management of Suppurative Primary level Secondary level Tertiary level 4. Appendices Epidemiology of Corneal Blindness and Suppurative Keratitis in SEAR Antimicrobial agents References Acknowledgements Foreword

Launching of Vision 2020: The Right to Sight has given a new impetus to the existing programmes for prevention of blindness globally. Countries in the South-East Asia Region have been quick to respond to this call. While remains the major cause of reversible visual loss in the Region, diseases of the are emerging as an important cause of . and vitamin A deficiency () have traditionally been the major cause of corneal blindness. With the introduction of the SAFE strategy for trachoma and mass distribution of vitamin A capsules, both these conditions have now been brought under control. In the vast agrarian society of South-East Asia, particularly in countries where primary health care and referral systems are weak, minor eye injuries sustained in agricultural farms often lead to corneal ulceration, loss of vision and many a time result in loss of eyes. This is entirely avoidable if known public health measures are applied effectively. WHO together with its Member States is currently dealing with this problem at two different levels. The first consists of developing a community model for prevention of post- traumatic corneal ulcer, and the second, providing a definitive guideline for effective management of established corneal ulcer. The purpose of these guidelines is to provide a simple yet effective management strategy to rapidly reduce morbidity and visual loss due to corneal ulceration. I am confident that this will be found useful by all those involved in caring for these patients. I would like to thank all our experts who have contributed to the development of these guidelines.

Samlee Plianbangchang, M.D., Dr. P.H. Regional Director About the Publication

Purpose The purpose of this document is to provide guidance in the management of superficial ocular trauma and established suppurative keratitis in order to minimize morbidity and visual loss from bacterial and fungal corneal infections. Need and Process of Development of Guidelines Corneal ulcer is a major public health problem in the (1-3, 5-18) developing world causing prolonged morbidity, loss of vision and, many a time, loss of eyes. It has tremendous socioeconomic implications as sufferers are often the bread earners in the family. Recognizing the public health importance of corneal ulcer, the WHO South-East Asia Regional office has taken several initiatives in the past, both for prevention of corneal ulcer as well as for its management, in the countries of South-East Asia at the request of the governments. Preventive interventions will be described in another publication. This document describes the management of corneal ulcer. Treatment of corneal ulcers has at best remained unsatisfactory across the health systems of the developing world. The Regional Office commissioned a study in 1999 to prepare an epidemiological and microbiological profile of corneal ulcer in the Region. This study identified the magnitude of the problem, microbial pattern of infection, antibiotic/antifungal sensitivity of the microbes as well as modifiable risk factors. This greatly helped to fill in the information gap. Subsequently, these findings were reviewed at an intercountry meeting on corneal blindness held in 2002. The participating countries recommended to WHO to develop definitive guidelines for the treatment of corneal ulcer suitable for use at different levels of health system. To respond to the above request, WHO entered into a contract with the Aravind Eye Care System (AECS) in Madurai, India, a WHO collaborating centre, for development of the guidelines. The first draft of the guidelines was prepared by Dr M Srinivasan and his colleagues based on the findings of the above cited study and review of the more recent literature. This draft was circulated among over 200 clinical and public health experts. Their inputs were incorporated in the revised draft which was reviewed by selected experts from six WHO collaborating centres and corneal experts across the . The list of the collaborating centres is given in Annex 6. The document was further refined at Aravind Eye Care System and finally reviewed at WHO.

1 Guidelines for the Management of Superficial Corneal Trauma and Infections in Primary Health Facilities

History and examination If there is a: • history of superficial injury; and/or • examination shows a corneal abrasion Treat with chloramphenicol, eye ointment (0.5 - 1%)three times per day for at least 3 days. 7 • Do not use any medicine containing steroids. • Do not use traditional medicines. Refer to an ophthalmologist • if pain and redness persist for 3 days; or • if there is a white mark on the cornea and a (corneal ulcer). Give the patient chloramphenicol ointment to use 3 times per day when you refer to an ophthalmologist or to the nearest eye care facility. Do not delay the referral of a patient with corneal ulcer. Clinical assessment and diagnosis Primary level

Corneal abrasion Corneal ulcer Inset abrasion without stain 8 2 Guidelines for the Management of 9 Suppurative Keratitis at the Secondary Level of Eye Care

History and examination Confirm diagnosis of suppurative keratitis (refer to Table 1 and photographs) Immediate referral to a tertiary ophthalmic centre is indicated if: • the ulcer is in only eye • the patient is a child • there is impending or actual perforation • a fungal ulcer is suspected on clinical examination, but KOH or other fungal stain is not available. Take a corneal smear: and stain with KOH (or other fungal stain) (19-22) to look for fungal hyphae. Admit the patient for in-patient treatment: • if there is immediate threat to vision • to ensure hourly treatment as below • to ensure follow up as below Treatment guidelines

No fungal hyphae seen on smear Fungal hyphae seen on smear

Cafazolin 5% and 5% drops hourly Gentamycin 1.4% drops hourly alone (no antibiotics)

Ciprofloxacin may be used instead or Amphotericin 0.15% drops of gentamycin. hourly – if hourly drops is not possible – then a sub-conjunctival inj. can be considered.

Treatment frequency, duration and followup:

– Daily examination until the – Examination every 2 days ulcer starts improving until the ulcer starts improving

– Then gradually reduce the – Then continue drops at frequency of drops and follow least 3 hourly for at 10 up over 2 weeks least 2 weeks after healing of the ulcer

Refer to tertiary ophthalmic centre if:

Not improving after 3 days Not improving after 7 days treatment treatment

Adjunctive therapy: • Includes cycloplegics; analgesics; anti- medication if indicated. • Do not use any preparation containing steroids. • Investigate for diabetes mellitus as a possible risk factor for corneal ulceration. Table-1: Typical clinical features

Features of bacterial ulcer Features of fungal ulcer

1. History of trauma to the cornea, 1. History of trauma with contact wear vegetable matter 2. Pain, redness, watering, 2. Suspect fungal ulcer if decrease in vision patient reports agriculture as main occupation. 3. Lid oedema (marked in gonococcal ulcer), purulent 3. Pain and redness are similar discharge in gonococcal ulcer to bacterial ulcer. But lid and bluish green discharge in oedema is minimal even in pseudomonas corneal ulcer severe cases unless patients have received native medicines 4. Round or oval in shape involving or peri ocular injections. central or para central part of the cornea. 4. Early fungal ulcer may appear Rest of the cornea is clear. like a dendritic ulcer of herpes simplex virus. The feathery may or may not 11 be present. borders are pathognomonic clinical features. Satellite lesions, 5. In pneumococcal ulcer the immune ring, and unlevelled advancing border will have hypopyon may aid in diagnosis. active infiltrate with undermined edges and the trailing 5. The surface is raised with greyish edge may show signs of healing. white creamy infiltrates, which Most of the pneumococcal ulcers may or may not appear dry. will show leveled hypopyon 6. Ulcer due to pigmented fungi associated with . will appear as brown or dark; 6. Pseudomonas ulcer will have raised, dry, rough, leathery short duration, marked stromal plaque on the oedema adjacent to the ulcer surface of the cornea with rapid progression. If untreated, will perforate within 2-3 days. Advanced ulcer may involve the also. 7. Ulcers caused by Moraxella and Nocardia are slowly progressive in immunocompromised hosts. Early Bacterial ulcer

12 Late Bacterial ulcer

Early Fungal ulcer

Late Fungal ulcer Fig.1 Management of Supurative Keratitis at the Secondary Level of eye care

Suppurative keratitis

Ulcer in an only eye The patient is a child Yes Refer to Tertiary Impending or actual perforation centre immediately Suspected fungal ulcer

No

Perform KOH smear or other fungal stain

13

Fungal hyphae seen

No Yes

Cefazolin 5% & Natamycin 5% or Gentamycin 1.4% Amphotericin 0.15% drops hourly drops hourly

Daily examination until Examination every 2 days improvement until improvement

No improvement after 7 days

Refer to tertiary ophthalmic centre How to perform a Potassium hydroxide (KOH) & Lactophenol cotton blue (LPCB) stain to identify fungal hyphae

Equipment required Preparing 10% KOH smear Essential equipment Weigh approximately 10g Kimura spatula (8 pellets) of KOH No 15 surgical blade Dissolve in 10ml of distilled water Sterile glass slides Add 1 drop of 10% glycerol Cover slips Prepare fresh stock every week Binocular microscopes Can be kept at room temperature 10% KOH in a dropper bottle Spirit Lamp Topical anaesthetic

Performing KOH smear Smear with fungal hyphae 1. Make the patient sit at the slit lamp or lie down over a bed. (need magnifiers, loupe or operating microscope), explain this simple procedure to 14 the patient 2. Instill one or two drops of tetracaine or 0.5% proparacaine. One can use 4% lignocaine if the above two are not available. Wait for a minute or two before scraping. 3. Keep two clean glass slides having 1cm circle made with glass pencil on the reverse side of the slide. 4. Scrape the base and edges of the corneal ulcer with flame sterilized kimura spatula or sterile 15# Bard Parker blade. 5. Streak the specimen over the glass slide within the circle; one for KOH and the other for Gram stain. 6. Apply KOH over the specimen. Cover the KOH smear with a cover slip and examine under light microscope immediately. 7. If the person is not trained to interpret the smear, send both slides immediately (within 2 hrs) to the microbiology laboratory. Equipment required Preparing LPCB smear

Essential equipment Lacto phenol cotton blue can be Kimura spatula obtained commercially and can be stored for a indefinite period. No 15 surgical blade Sterile glass slides Cover slips Binocular microscopes LPCB stain Spirit Lamp Topical anaesthetic

How to perform a LPCB smear Smear with fungal hyphae

1. Make the patient sit at the slit lamp or lie down over a bed. (need magnifiers, loupe or 15 operating microscope), explain this simple procedure to the patient 2. Instill one or two drops of tetracaine or 0.5% proparacaine. One can use 4% lignocaine if the above two are not available. Wait for a minute or two before scraping. 3. Keep two clean glass slides having 1cm circle made with glass pencil on the reverse side of the slide. 4. Scrape the base and edges of the corneal ulcer with flame sterilized kimura spatula or sterile 15# Bard Parker blade and spread it on the glass slide within the circle. 5. Apply locto phenol cotton blue over the specimen. 6. Cover with a cover slip and examine under light microscope. 16 3 Guidelines for the Management of Suppurative Keratitis at Tertiary Ophthalmic Centres

History and Examination: Use a standard form and classification of corneal ulceration. (see Annex 4) Take a Corneal Smear: Stain with KOH (or other fungal stain) and Gram stain. Culture on (a) Sheep blood agar; (b) Sabourauds; and if possible (c) Brain-heart infusion. Other culture media may also be indicated in selected cases. Admit the patient for in- patient treatment: If there is immediate threat to vision If the patient is a child 17 To ensure hourly treatment as below To ensure follow -up as below Treatment guidelines:

Smear No Gram Gram Fungal hyphae not organism positive negative seen possible seen on bacteria bacteria smear seen seen Cefazolin 5% and Natamycin 5% Gentamycin 1.4% drops hourly drops hourly

Ciprofloxacin may be used instead or Amphotericin of gentamycin. If hourly drops is not possible 0.15% drops then a sub-conjunctival injection hourly can be considered.

Treatment frequency, duration and follow-up:

Daily examination until the Examination every 2 days until ulcer is improving the ulcer starts improving

Then gradually reduce frequency of Then continue drops at least 3 drops and follow up hourly for at least 2 weeks after over 2 weeks healing of the ulcer Adjunctive therapy includes cycloplegics; analgesics; anti-glaucoma medication, if indicated. Figure 2 describes management if the ulcer does not respond to or worsens on above treatment. Fig.2: Decision making algorithm in the management of therapeutic failures in presumed bacterial keratitis

Stop antibiotic for 24-48hr No Culture performed and reculture; conrneal biopsy in severe progressive cases Yes

Growth No Growth

Organisms No Change antibiotic to Add specific susceptible cover organism media for bacteria, to antibiotics used involved fungi and parasite Yes 18

Wait for Consider 72 hours of NoGrowth of No 72 hrs of Surgical therapy organism treatment Options

Yes Yes

Treat specifically

Host Inadequate dosing Non-compliance immunocompromised

Increase to hourly Repeat subconj. Supplement drops dosing Injection and or with subconj.inj hospitalize & consider systemic antibiotics treat the cause Role of Topical Steroids Topical steroids are not recommended in any case of fungal keratitis. The role of topical steroids in bacterial keratitis is controversial. If steroids are used it should be with great caution and close obser vation. Role of Systemic Antimicrobials Systemic antifungals are recommended in fungal ulcers, which are: large and deep, or perforating, or have scleral involvement Systemic antibiotics are recommended in bacterial ulcers if there is scleral involvement and may be used in perforated cases. Role of Surgery Surgical procedures may include:

Debridement/superficial keratectomy Surgical removal of corneal epithelium without causing injury to the basement membrane. 19 Indication Epithelial herpes simplex virus keratitis Recurrent corneal erosion For diagnosing superficial infective keratitis Enhances penetration of topical antibiotics. Techniques This procedure is performed under topical anaesthesia on a slit lamp or operating microscope with sterile cotton tipped applicator, weckel sponge or surgical blade. Superficial Keratectomy Surgical removal of corneal epithelium including Bowman’s membrane and anterior stroma of the diseased cornea. Indication Biopsy in non-healing corneal ulcer Debulking of infective material Technique This procedure is performed under aseptic condition with topical or subconjunctival anaesthesia using 15# Bard Parker blade. Tarsorrhaphy Lateral Central Indication Exposure keratitis (Bells palsy) Neuroparalytic keratitis Lateral tarsorraphy is frequently performed in an eye having Bell’s palsy with non-healing suppurative keratitis. Technique This procedure is performed at a minor operating theatre: Local infiltration with 2% lidocaine at the lid margins. About 1-2 mm of inter-marginal strip is shaved off deep upto dermis and apposed with 4 “0” silk suture and anchored with bolsters. The release of tarsorraphy depends upon the etiology of lagophthalmus and healing response of the ulcer. Tissue Adhesive This procedure is performed for: wounds with a small amount of tissue loss persistent aqueous leakage small lacerations 20 puncture wounds The tissue bed must be dry and free of epithelial cells. Technique A thin film of adhesive is applied using a small gauge disposable needle, a micro capillary applicator or the broken wooden end of a sterile cotton applicator. Following application, adhesives should be given several minutes to dry before any other manipulation. Conjunctival flaps This is rarely performed for suppurative keratitis. Indications Non-healing superficial ulcer Peripheral corneal ulcers with descemetole or small perforation Contraindication Perforated central corneal ulcer Advantages Promotes healing providing better nourishment to the underlying cornea Disadvantages Monitoring the progress of ulcer is difficult Delays or impedes the penetration of topical antibiotics Visual outcome will be poor due to scarring and vascularisation Technique This procedure is performed under local anaesthesia as in cataract surgery. It is taken up under general anaesthesia if the patient is non-cooperative or in the paediatric age group. Specific drugs should be continued post-operatively. Patch Graft Indication Descemetocele Small perforation Patchgraft is usually 5 mm or 6 mm in size. Recipient bed is cleared of debris and not trephined. Lamellar or full thickness donor button could be anchored. This procedure is performed in the operating room under surgical microscope. Interrupted suture (12-16) is applied using 10/o or 9/o nylon. Appropriate antibiotics are continued post-operatively. Penetrating keratoplasty Maintains the integrity of the globe for future optical grafts Promotes healing of corneal ulcer by total removal of pathology As a diagnostic technique to form a good source for histopathologi cal and microbiological examination 40-50% of these patients recover useful vision Carries better prognosis in bacterial corneal ulcers 21 The indications for surgical intervention include: Non-healing in spite of all medical therapy Impending or actual perforation If the ulcer does not respond to treatment: Review with gram stain, culture and sensitivity results If the organism is unknown, consider stopping all treatment for 48 hours, take new smears, cultures, and if required a corneal biopsy. Use culture media for viral and uncommon pathogens. (anaerobes, acanthamoeba, mycobacteria). References

1. Katz NNK, Wadud SA, Ayazuddin M. Corneal ulcer in Bangladesh. Annals of 1983; 15 : 834-836 2. Bharathi MJ, Ramakrishnan R, Vasu S. Epidemiology of bacterial keratitis in a referral centre in south India. Indian J Ophthalmol (in press) 3. Goonawardana SA, Ranasinghe KP, Arseculeretnae SN, et al. Survey of mycotic and bacterial keratitis in Sri Lanka. Mycopathologia 1994; 127: 77-81 4. Ginrich WD. Keratomycosis. JAMA 1962: 179: 602 - 8. 5. Srinivasan M, Gonzales CA, George C, et al. Epidemiology and aetiological diagnosis of corneal ulceration in Madurai, south India. Br J Ophthalmol 1997; 81: 965-971 6. Bharathi MJ,Ramakrishnan R, Vasu S. Nocardia asteroides keratitis in South India.Indian J Med Microbiology 2003;21 31 - 36 7. Mahajan VM. Ulcerative keratitis: an analysis of laboratory data in 674 cases. J Ocul Ther Surg 1985; 4: 138-41 8. Kotigadde S, Ballal M, Jyotirlatha, et al. Mycotic keratitis: a study in coastal Karnataka. Indian J Ophthalmol 1992; 40: 31-3 9. Sundaram BM, Badrinath SS, Subramaniam S. Studies on mycotic 22 keratitis. Mycoses 1989; 32: 568-72 10. Venugopal PL, Venugopal TL, Gomathi A, et al. Mycotic Keratitis in Madras. Indian J Pathol Microbiol 1989; 32: 190-7 11. Imwidthaya P.Mycotic keratits in Thailand. J Med Vet Mycol 1995; 33: 81-2 12. Thomas PH. Mycotic keratitis - underestimate of mycoses. J Med Vet Mycol 1994;32:235-56. 13. Bharathi MJ, Ramakrishnan R, Vasu S, et al. Aetiological diagnosis of Microbial keratitis in south India. Indian J Med Microbiol 2002; 20: 19- 24. 14. Sharma S, Sujatha G, Murali AK, Garg P, Rao GN Trends in associated microbial keratitis in southern India. Ophthalmology, 2003; 110: 138 - 143. 15. Garg P, Sharma S, Rao G Net al. Ciprofloxacin resistant pseudomonas keratitis. Ophthalmology 1999; 106: 1319 16. The Central Microbial Keratitis: The Philippine Journal of Ophthalmology.vol 25 No.1 supplement; January - March 2000, 23-31 17. Gopinathan U, Garg P, Fernandes M, Sharma S, et al. The Epidemiological features and laboratory results of Fungal Keratitis. Cornea, 2002; 21 555 - 559. 18. Parmar P, Salman A, Kalavalhy M et al. Pneumococcal keratitis - a clinical profile: Clinical and Experimental ophthalmology 2003; 31:44-47. 19. Bharathi MJ, Ramakrishnan R, Vasu S, et al. Epidemiological characteristics and laboratory diagnosis of fungal keratitis: a three year study. Indian J Ophthalmol 2003: 51 : 315 - 321 20. Medical Laboratory Manual for Tropical countries; Vol II Microbiology, Monica Cheesbrough, Tropical Health Technology/Butteys worth 21. Gorner JT, Robinson NM, Osato M, Wilhelmus KR. Comparison of acridine orange and Gram stains in bacterial keratitis. A J. Ophthalmol 1998; 106: 735-37. 22. Groden LR, Rodenite J, Brinson JH, Gewvert GI. Acridine orange and Gram stains in infectious keratitis. Cornea 1990; 9:1222-24. 23. Jones DB. Decision making in the management of microbial keratitis. Ophthalmol 1981; 88: 814-20. 24. Wahl JC, Katz HR, Abrams DA. Infectious keratitis in Baltimore. Ann Ophthalmol 1991;23:234-7. 25. Harris DJ Stulting RD,Waring GO, Late bacterial and fungal keratitis after ; spectrum of pathogoneris, graft survival and visual progress Ophthalmology 1988,95: 1450 - 7 26. Liesegang TJ, Forster RK. Spectrum of microbial keratitis in South Florida. Am J Ophthalmol, 1980 90:38-41. 27. Forster R, Resell G. The diagnosis and management of keratomycosis - Cause and diagnosis. Arch Ophthalmol, 1975; 93:975-8. 23 28. Vajpayee RB, Dada T, Saxena R, et al. Study of first contact management profile of cases of infectious keratitis- A hospital based study. Cornea, 2000; 19:52-56 29. Mcleod S, Kolahdouz, khodam I, et al. Role of smears, cultures and antibiotic testing with management of suspected infectious keratitis. Ophthalmology 1996; 103: 23 - 28 30. Dart JKG, Stapleto NF, Minassian D. Contact lenses and other risk factors in microbial keratitis. Lancet 1991; 338:650-3 31. Ormerod FD, Hertzmark E, Gomez DS et al. Epidemiology of microbial keratitis in southern California. Ophthalmology 1987; 94:1322-33. 32. Boonpasart S, Kasetsuwan N, Puangsricharern V. Infectious keratitis at King Chulalongkorn Memorial Hospital: a 12 year retrospective study of 391 cases. J Med Assoc Thai 2002; 85( suppl 1): S217-30 33. Whitcher JP, Srinivasan M, Upadhyay MP. Corneal blindness: a global perspective Bull WHO 2001; 79: 214-221 34. Upadhyay MP, Karmacharya PC, Koirala S, et al. Epidemiologic characteristics, predisposing factors, and aetiological diagnosis of corneal ulceration in Nepal. Am J Ophthalmol 1991; 111: 92-9 35. Upadhyay MP, Rai NC, Brandt F, Shrestha RB. Corneal ulcers in Nepal. Graefe’s Arch Clin Exp Ophthlamol 1982; 219: 55-9 36. Wong TY, Fong KS, Tan DT. Clinical and microbiological spectrum of fungal keratitis in Singapore: a five year retrospective study. Int Ophthalmol 1997; 21: 127-30 37. Houang E, Lam D, Fan D, Seal D. Microbial keratitis in Hong Kong: relationship to climate, environment and contact lens disinfection. Trans R Soc Trop Med Hyg 2001; 95: 361-7 38. Upadhyay MP, Karmacharya PC, Koirala S, et al. The Bhaktapur Eye Study: Ocular trauma and antibiotic prophylaxis for the prevention of corneal ulceration in Nepal. Br J Ophthalmol 2001; 85: 388-92 39. Rahman MR, Johnson GJ, Husain R, et al. Randomised trial of 0.2% chlorhexidine gluconate and 2.5% natamycin for fungal keratitis in Bangladesh. Br J Ophthalmol 1998; 82: 919-25 40. Dunlop AA, Wright ED, Howlander SA, et al. Suppurative corneal ulceration in Bangladesh. A study of 142 cases examining the microbiological diagnosis, clinical and epidemiological features of bacterial and fungal keratitis. Aust N Z Ophthalmol 1994; 22: 105-10 41. Williams G, McClellan K, Billson F. Suppurative keratitis in rural Bangladesh: the value of gram staining in planning management. Int Ophthalmol 1991; 15(2): 131-5 42. Williams G, Billson F, Husain R, et al. Microbiological diagnosis of suppurative keratitis in Bangladesh. Br J Ophthalmol 1987; 71: 315-21 43. Leck AK, Thomas PA, Hagan M, et al. Aetiology of suppurative corneal ulcers in Ghana and south India, and epidemiology of fungal keratitis. Br J Ophthalmol 2002; 86: 1211-15 24 44. Mah FS New antibiotics for bacterial infections. Ophthalmol Clin N Am 2003; 16: 11-27 45. Gangopadhyay N, Daniell M, Weih L, Taylor HR. Fluoroquinolone and fortified antibiotics for treating bacterial corneal ulcers. Br J Ophthalmol 2000; 84: 378-84 46. Kowalski RP, Karenchak LM, Romanowski EG. Infectious disease: changing antibiotic susceptibility. Ophthalmol Clin N Am. 2003; 16:1-9 47. Bharathi MJ, Ramakrishnan R, Vasu S, et al. In vitro efficacy of antibacterials against bacterial isolates from corneal ulcers. Indian J Opthalmol 2002; 50: 109-114 Dandona R and Dandona L “Current Ophthalmology:Review of findings of the APEDS - Andhrapradesh Study:1. policy implications for eye care services. Int J. Ophthalmol; 2001; 49: 215-234 Annex-1

Epidemiology & Management Corneal Blindness and Suppurative Keratitis

1. Epidemiology of Corneal Visual Loss (a) The magnitude of blindness (all causes) in the countries of the South-East Asia Region varies from 3 000 people per million population in communities with good economy and health care to over 10 000 per million in low-income settings. (b) Corneal scarring is a common cause of blindness in low-income settings being responsible for 5-20% of all blindness. (c) Important causes of bilateral corneal blindness include trachoma, vitamin A deficiency, ophthalmia neonatorum and bacterial/fungal infections. (d) The Andhra Pradesh Eye Disease Study (APEDS) (48) in Andhra Pradesh (India) estimated that 1,200 people per million population are blind (<3/ 60) from corneal pathology. (e) The prevalence of unilateral blindness due to in low- income settings is estimated to be in the range of 5,000 to 20,000 people 25 per million population. 2. Epidemiology of Suppurative Keratitis (a) Suppurative keratitis due to bacteria and fungi is the main cause of unilateral corneal scar. (b) A two-year prospective study of over 34 000 people from a rural setting in Nepal reported an incidence rate of corneal ulceration of 8000 cases per million population per year (160 cases per million pop per week). The results of retrospective studies in the Region are summarized in Table 1. It is estimated that up to 12 million cases of suppurative keratitis occur each year in the Region. An unknown proportion of these cases go on to visual loss or blindness. (c) Within the SEA Region the causes of suppurative keratitis depend mainly on climatic factors. (d) In warm, humid areas the relative proportion of fungal to bacterial ulcers approaches 50:50, while in cool dry climates most ulcers are due to bacteria. (e) The major bacterial causes are streptococcus; pseudomonas and staphylococcus. (f) The major fungal isolates are fusarium and aspergillus species. Candida is relatively uncommon. (g) Acanthamoeba even in well-equipped tertiary facilities is responsible for less than 5% of ulcers. (h) Agricultural trauma is the main risk factor; seasonal variations in incidence can occur. Contact lens wear is not an important risk factor within the Region. 3. Management of Suppurative Keratitis

(a) The outcome of corneal injury with secondary infection can be markedly improved by early diagnosis and appropriate treatment with antibiotics at the primary level of health care. (b) Inappropriate use of traditional medicines or topical steroids and delay in referral to an ophthalmologist for diagnosis and treatment all contribute to unnecessary visual loss from superficial corneal trauma and secondary infection. (c) Identification of fungal hyphae in a corneal smear with KOH stain is a simple, inexpensive and sensitive test, which should routinely be performed by ophthalmologists in cases of suppurative keratitis, particularly in areas where fungi are known or expected to occur. Lactophenol cotton blue is a simple alternative fungal stain reported from some countries. (d) Antifungal treatment is not recommended unless there is evidence of fungal infection by microscopy or culture. Natamycin is the drug of first 26 choice in geographical areas where fusarium species predominate. (e) The recommended first line antibiotic treatment is a combination of cephazolin and fortified gentamycin. Table 1: Reported incidence of corneal ulceration in the SEA Region*

Country Incidence / Reference Comment (million pop)

Nepal 7990 BJO41 Prospective 2 yr study India 1130 BJO5 Retrospective study Myanmar 7100 *Country report Retrospective study Bhutan 3390 *Country report Retrospective study

Table 2: Proportion of suppurative keratitis with fungal organisms in the SEA Region*

Organism Sri Lanka India Nepal Bangladesh Thailand

Any 33 19-4517-44 21-36 25

Table 3: Microbiological profile of fungal Keratitis in the SEA Region* (Percentages) 27 Organism Sri Lanka India Nepal Bangladesh Thailand

Aspergillus 1816-53 46-60 29-29 34 Fusarium 80 10-47 13 14-28 26

Table 4: Microbiological profile of bacterial keratitis in the SEA Region*39 - 45 (Percentages)

Organism India Nepal Bangladesh Thailand Steptococcus pneumoniae 44 31 22 3 Pseudomonas aeruginosa 10 12 11 7 Staphylococcus epidermidis 14 11 20 45 Others or unknown bacteria 32 46 47 45

* (Figures as reported by Member Countries based on their hospital data projected to a captive population) Annex 2

Antimicrobial agents

Sensitive Common Antibiotic Dose Comment organisms resistance

Cefazolin Strep pneumo, Most gram – 5.0% Not and most bacteria commercially gram+ bact. available, must be prep- ared from injectable form as and when necessary

Gentamycin Most gram – Strep 1.4% Commercial and some pneumo drops need gram + bact. to be fortified

Ciproflox- Most gram – Most Strep 0.3% Commercially acin and many pneumo available 28 gram + bact.

Chloram- Many gram Good for 1.0% Commercially phenicol + and pneumo available in gram – bact. drops and ointment

Antifungual

Natamycin Filamentous ------5.0% Commercial fungi – ------available Fusarium

Amphote- Effective Moderate 0.15% Not commer- ricin – B against most response to cially available, yeasts Fusarium must be prep- Aspergillus ared from an injectable preparation Annex 3

Classification, Dosage and Spectrum of useful Antifungal agents

Dosage

Drug Topical Systemic Useful antifungal spectrum

Polyene 3.3% ointment Poorly soluble, Moderately Antifungals or 100 000 not absorbable effective against Tetrenes units/g every hr from most Candida during day, gastrointestinal species. Slight every 2hr at tract. Not effect against Nystatin night recommended filamentous for systemic use fungi.

Natamycin 5% suspension Poorly soluble, Good effect every hr during not against Candida, day, every 2hr recommended Aspergillus, 29 during night for systemic Fusarium and use some other fungi. Poorly soluble, difficult to treat deep mycotic corneal ucler

Pentenes 0.5% solution 0.25mg/kg on Highly effective too toxic; 0.1 day 1; increase against Candida, to 0.2% by 0.25 to moderately Amphotericin– solution 1mg/kg/day. effective B effective every Total dosage against some hr during day 1000-1500mg. filamentous every 2hr at Use 50 mg fungi. night diphenhydra- Excellent for mine systemic use orally before against Candida. dose. Give as Synergistic with intravenous drip flucytosine and in 5% dextrose this combination and water with is 1000 units recommended heparin Dosage

Drug Topical Systemic Useful antifungal spectrum

Imidozole 1% solution in 60mg-100mg/ Highly effective derivative arachis oil kg/day for against Aspergi- antifungals every 1hr until 2 weeks llus Candida Trityl response species, and imidozole occurs, then 4 some filamentous group times a day for fungi, including 8 to 12 Paecilomyces, Clotrimazole weeks Dreschlera, Alternaria, & Cladosporium species. Poor effect against Fusarium.

Phenethylalco 1% solution in 300 to 600 mg/ Active against a hol group arachis oil day larger spectrum Miconazole every 1 hr intravenously of filamentous 30 during day, has been used fungi and every 2hr at for ocular Candida night infection organisms, but less effective against Aspergillus and Fusarium species than other agents. It also has some anti- bacterial activity against gram positive organisms

Econazole 1% solution in 200mg/day More effective arachis oil systemically than Miconzole every hr during against day, every 2hr Aspergillus, during night Fusarium, and Pencillium species but less effective against Candida species Dosage

Drug Topical Systemic Useful antifungal spectrum

Itraconazole 1% suspension Oral adult dose It has a wider and 1% 200mg/day. It spectrum of ointment should be activity than continued for Imidozoles. It 1-2 moths has an excellent in vitro activity against Aspergillus and Candida. It has not been very effective against Fusarium. Oral administration of Itracanozole appears to have less penetration than other triazoles into the 31 cornea, aqueous and vitreous.

Pyramidime 1% solution for 150 mg/g/day Effective against 5-Flurocytisine topical use is by oral route. Candida, well Can also be Cryptococosis tolerated administered and related fungi. intravenously Resistant strains emerge rapidly on monotherpy, usually combined with Amphotericin-B for treatment of sensitive fungi.

Adapted in part from Jones BR: principles in the management of Oculomycosis. Am J Ophthalmol, 1975; 79 : 719 and Thomas P A: Fungal infections of the corneal Eye 2003, 17:852-862. Annex 4

Standard Clinical Examination Form for Tertiary Care Center: Corneal Ulcer Patient Proforma

Patient details Patient number: Name: Age: ______Sex: M F Address : ______

Ophthalmic history Trauma Eye surgery Dacrocystitis Ocular surface disorder Corneal exposure Contact lens wear Diabetes mellitus

Does the patient have a history of diabetes? Y/N.

32 If yes, for how long ______

If other, give details:

Current topical antibiotic Y / N specify ______

Current topical antifungal Y / N specify ______

Current topical steroid Y / N specify ______

Traditional eye medicine Y / N specify ______

Presentation Date of primary presentation ___/____/____

Eye RE / LE / Bilateral

Duration of symptoms ______days

Visual Acuity (uncorrected) Right ______Left ______

BASE - LINE EXAMINATION

Ulcer size Lid Oedema Mild Moderate Severe

Depth of Ulcer Deep Superficial

Depth of infiltrate Anterior stroma Mid stroma Posterior stroma

Hypopyon Absent Present Height ______mm REVIEW Date: _____/____/____

MICROBIOLOGY RESULTS Gram stain ______date ___/___/___ KOH ______date ___/___/___ Locto phenol Cotton Blue ______date ___/___/___ 33 Culture (BA) ______date ___/___/___ Culture (SDA) ______date ___/___/___ others (specify) date ___/___/___

Eye RE / LE / Bilateral Visual Acuity Right ______Left ______

Ulcer size :

Depth of infiltrate Anterior stroma Mid stroma Posterior stroma

Hypopyon Absent Present Height ______mm Assessment Healing No Change Working Perforation Annex 5

Classification of Corneal Ulcers

Microbial ulcers These are caused by Staph or Strep species, present with pain, redness, lid oedema and discharge that varies according to the duration and severity of the ulcer. The ulcer is well circumscribed and may be central or at mid-periphery of the cornea. The borders of the ulcer are usually round or oval. Stromal infiltration may be present under the base of the ulcer with a yellowish white appearance. In severe ulcers, there may be folds in the deep stroma radiating from the ulcer bed; additionally a levelled hypopyon, 3 to 4 + cells and flare may be seen. Rarely posterior corneal abscess may be present with intact epithelium. Pneumococcal ulcer: May be associated with chronic dacryocystitis in 55% of cases 2, 18. Haemorrhagic hypopyon may be associated with pneumococcal ulcer. Frequently seen in having degeneration, epithelial problem and scars. The creeping edges and dense infiltrate at the leading edge of the ulcer are characteristic clinical features of pneumococcal ulcer. 34 Gram positive bacterial ulcers The uninvolved portion of cornea will appear clear without oedema or infiltration. Gram negative bacterial ulcer Pseudomonas ulcer will have a short history. Signs and symptoms will be severe Diffuse ulceration with stromal infiltrate or oedema involving adjacent or whole cornea resulting in ground glass appearance is a distinguishing clinical feature from other ulcers. Mucopurulent discharge is seen frequently and it appears bluish green in untreated severe pseudomonas ulcers. Marked lid oedema and chemosis than seen in Gram positive bacterial ulcers. The ulcer perforates within few days if not managed properly. Pseudomonas ulcer may develop as ring abscess without epithelial defect. Ulcer caused by gram negative cocci Marked lid oedema and copious purulent discharge; Pus will spurt out when the lids are separated. Ulcer is usually bilateral and perforates within short duration. Lid abnormalities like , , trichiasis, improper closure of lids as in leprosy, neurotrophic lesions due to herpes simplex, zoster or corneal degenerations, bullous keratopathy, and dry eyes predispose to bacterial ulcer in the SEA Region. Satellite lesions, immune ring, endothelial plaques are present in both bacterial and fungal keratitis and do not help to differentiate between bacterial and fungal keratitis. Fungal Keratitis The ulcer usually involves the central or exposed part of cornea. The edges are feathery with finger like projections, mimicking a herpetic dendritic ulcer in early stages. The fungal ulcer has raised creamy surface with greyish white infiltrate; The base of the ulcer is dry leathery (not in early fungal ulcer of about one week duration). The hypopyon is unlevelled and solid. There may be posterior corneal abscess with intact corneal epithelium. The remaining cornea appears clear. Pigmented fungal ulcer The surface will show brown or dark pigmentation which is tough and leathery; Very difficult to scrape for diagnostic or therapeutic purposes. Untreated or improperly treated ulcer may progress to involve sclera also. Fungal ulcer caused by Candida Usually involves an immunocompromised host and cornea; 35 The ulcer appears as collar button and mimics staphylococcal ulcer. Annex 6

List of WHO Collaborating Centres participating in the development of the Guidelines

1. Aravind Eye Hospitals and Aravind Eye Care System, Madurai, India 2. L V Prasad Eye Institute, Hyderabad, India 3. Dr R P Centre for Ophthalmic Sciences, New Delhi, India 4. London School of Hygine and Tropical Medicine London, UK 5. Proctor Foundation for Research in Vision and Ophthalmology University of California, San Fransisco, USA 6. Department of Ophthalmology, Juntendo University, Tokyo, Japan.

36 Acknowledgements

We would like to thank Dr M. Srinivasan, Director of the Cornea Service of Aravind Eye Care System (AES), Madurai, India for undertaking to review the available literature on corneal ulcer and for preparing the Guidelines incorporating changes at different levels. We would also like to thank the ophthalmologists and public health experts who gave us their comments on the first draft. We would like to gratefully acknowledge the help of the following experts who participated in a workshop to finalize the draft: Prof Allen Foster, London School of Hygiene and Tropical Medicine, U.K; Dr Prashanth Garg, L.V.Prasad Eye Institute, Hyderabad, India; Dr Steven McLeod, Proctor Foundation, University of California, San Francisco, USA, Dr John P. Whitcher, Proctor Foundation University of California San Francisco,USA; Dr Sanduk Ruit, Tilganga Eye Center, Kathmandu, Nepal; Prof. K Konyama, Juntendo University, Tokyo, Japan, Dr J.S.Titiyal, R.P.Centre, All India Institute of Medical Sciences,New Delhi,India and Dr Md.Saleh Ahmed, National Institute of Ophthalmology, Dhaka, Bangladesh. Dr R. Pararajasegaram and Dr Madan P Upadhyay also participated at the expert group meeting on behalf of WHO.