Eyelids, Conjunctiva, Cornea & Sclera
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Understanding Corneal Blindness
Understanding Corneal Blindness The cornea copes very well with minor injuries or abrasions. If the highly sensitive cornea is scratched, healthy cells slide over quickly and patch the injury before infection occurs and vision is affected. If the scratch penetrates the cornea more deeply, however, the healing process will take longer, at times resulting in greater pain, blurred vision, tearing, redness, and extreme sensitivity to light. These symptoms require professional treatment. Deeper scratches can also cause corneal scarring, resulting in a haze on the cornea that can greatly impair vision. In this case, a corneal transplant may be needed. Corneal Diseases and Disorders that May Require a Transplant Corneal Infections. Sometimes the cornea is damaged after a foreign object has penetrated the tissue, such as from a poke in the eye. At other times, bacteria or fungi from a contaminated contact lens can pass into the cornea. Situations like these can cause painful inflammation and corneal infections called keratitis. These infections can reduce visual clarity, produce corneal discharges, and perhaps erode the cornea. Corneal infections can also lead to corneal scarring, which can impair vision and may require a corneal transplant. Fuchs' Dystrophy. Fuchs' Dystrophy occurs when endothelial cells gradually deteriorate without any apparent reason. As more endothelial cells are lost over the years, the endothelium becomes less efficient at pumping water out of the stroma (the middle layers of the cornea). This causes the cornea to swell and distort vision. Eventually, the epithelium also takes on water, resulting in pain and severe visual impairment. Epithelial swelling damages vision by changing the cornea's normal curvature, and causing a sightimpairing haze to appear in the tissue. -
MRSA Ophthalmic Infection, Part 2: Focus on Orbital Cellulitis
Clinical Update COMPREHENSIVE MRSA Ophthalmic Infection, Part 2: Focus on Orbital Cellulitis by gabrielle weiner, contributing writer interviewing preston h. blomquist, md, vikram d. durairaj, md, and david g. hwang, md rbital cellulitis is a poten- Acute MRSA Cellulitis tially sight- and life-threat- ening disease that tops the 1A 1B ophthalmology worry list. Add methicillin-resistant OStaphylococcus aureus (MRSA) to the mix of potential causative bacteria, and the level of concern rises even higher. MRSA has become a relatively prevalent cause of ophthalmic infec- tions; for example, one study showed that 89 percent of preseptal cellulitis S. aureus isolates are MRSA.1 And (1A) This 19-month-old boy presented with left periorbital edema and erythema preseptal cellulitis can rapidly develop five days after having been diagnosed in an ER with conjunctivitis and treated into the more worrisome condition of with oral and topical antibiotics. (1B) Axial CT image of the orbits with contrast orbital cellulitis if not treated promptly shows lacrimal gland abscess and globe displacement. and effectively. Moreover, the community-associ- and Hospital System in Dallas, 86 per- When to Suspect ated form of MRSA (CA-MRSA) now cent of those with preseptal cellulitis MRSA Orbital Cellulitis accounts for a larger proportion of and/or lid abscesses had CA-MRSA. Patients with orbital cellulitis com- ophthalmic cases than health care– These studies also found that preseptal monly complain of pain when moving associated MRSA (HA-MRSA). Thus, cellulitis was the most common oph- the eye, decreased vision, and limited many patients do not have the risk fac- thalmic MRSA presentation from 2000 eye movement. -
Taking the Mystery out of Abnormal Pupils
Taking the mystery out of abnormal pupils No financial disclosures Course Title: Taking the mystery out [email protected] of abnormal pupils Lecturer: Brad Sutton, OD, FAAO Clinical Professor IU School of Optometry . •Review of Anatomy Iris anatomy Iris sphincter Iris dilator Parasympathetic pathway Sympathetic pathway Parasympathetic Pathway Parasympathetic Pathway Light stimulates the retina then impulse Four neuron arc travels with the ganglion cells through the Retina to the pretectal nucleus in the chiasm into the optic tracts. 80% go to the midbrain (1) LGN , 20% to the pretectal nuclei.They Pretectal nucleus to the EW nucleus (2) then hemidecussate and terminate at the EW nucleus EW nucleus to the ciliary ganglion (3) Ciliary ganglion to the iris sphincter with short ciliary nerves (4) 1 Points of Interest Sympathetic Pathway Within the second order neuron there are Three neuron arc 30 near response fibers for every light Posterior hypothalamus to ciliospinal response fiber. This allows for light - near center of Budge ( C8 - T2 ). (1) dissociation. Center of Budge to the superior cervical The third order neuron runs with cranial ganglion in the neck (2) nerve III from the brain stem to the ciliary Superior cervical ganglion to the dilator ganglion. Superficially located prior to the muscle (3) cavernous sinus. Points of Interest Second order neuron runs along the surface of the lung, can be affected by a Pancoast tumor Third order neuron runs with the carotid artery then with the ophthalmic division of cranial nerve V 2 APD Testing testing……………….AKA……… … APD / reverse APD Direct and consensual response Which is the abnormal pupil ? Very simple rule. -
Special Considerations in Cataract Surgery: Five Cornea Challenges
Clinical Update EXTRA CONTENT AVAILABLE CATARACT Special Considerations in Cataract Surgery: Five Cornea Challenges by linda roach, contributing writer interviewing preston h. blomquist, md, rosa a. braga-mele, md, kimberly a. drenser, md, phd, herbert e. kaufman, md, marguerite mcdonald, md, and roger f. steinert, md s the most common surgical choices, said Marguerite McDonald, IOL Selection procedure in ophthalmol- MD, of Lynbrook, N.Y. The device en- ogy, replacement of a cloudy ables the surgeon to directly measure 1 crystalline lens with an the eye’s aphakic refractive power in intraocular lens (IOL) usu- the operating room. Aally presents the ophthalmologist with Using intraoperative aberrometry is familiar sets of surgical routines. But becoming more commonplace, as “it what about those cases that involve may help in achieving more accuracy comorbidities or other complicating with IOL power selection,” Dr. Mc- factors? Donald said. Several experts shared their per- Tips on IOL selection. The chosen spectives on approaching out-of-the- IOL should be shaped to neutralize After an off-center LASIK procedure ordinary cataract surgeries in ways spherical aberrations, said Rosa A. such as this, the irregularity of the that offer the best chance at optimiz- Braga-Mele, MD, at the University of corneal topography indicates that a ing patient outcomes. This month, Toronto. “In anybody who has had multifocal IOL should be avoided. here’s a look at five challenges involv- myopic LASIK or PRK, I think it’s very ing the cornea. important to use a negatively aspheric prior to cataract surgery. 2) A dysfunc- IOL, because these patients have more tional, unstable tear film will affect the Challenge: Prior Refractive Surgery positively aberrant corneas. -
Adult Patients Common Eye Infections
Common Eye Dermatitis: HZV and HSV Infections: Adult • Redness of periocular skin can be allergic Patients (if associated with prominent itching) or bacterial (if associated with open sores/wounds) Julie D. Meier, MD Assistant Professor of Ophthalmology • Both HZV and HSV can have devastating ocular sequelae if not treated promptly OSU Eye and Ear Institute General Categories of Herpes Zoster Eye Infections Ophthalmicus • Symptoms: Skin rash and pain, may be • Dermatitis of Lids (HZV, HSV) preceded by headache, fever, eye pain or • Cellulitis of Lids (pre- vs post-septal) blurred vision • Blepharitis • Signs: Vesicular skin rash involving CN V • Conjunctivitis distribution; Involvement of tip of nose can predict higher rate of ocular involvement • Keratitis 1 Herpes Zoster Herpes Simplex Virus Ophthalmicus • Symptoms: • Work-up 9 Duration of rash; Immunocompromised? 9 Red eye, pain, light sensitivity, skin rash 9 Complete ocular exam, including slit 9 Fever, flu-like symptoms lamp, IOP, and dilated exam • Signs: • Can have conjunctival or corneal involvement, elevated IOP, anterior 9 Skin rash: Clear vesicles on chamber inflammation, scleritis, or erythematous base that progress to even involvement of retina and optic crusting nerve. Herpes Zoster Herpes Simplex Virus Ophthalmicus • Work-up: • Treatment: 9 Previous episodes? 9 If present within 3 days of rash’s 9 Previous nasal, oral or genital sores? appearance: oral Acyclovir/ Valacyclovir 9 Recurrences can be triggered by fever, stress, trauma, UV exposure 9 Bacitracin ointment to skin lesions 9 External exam: More suggestive of HSV 9 Warm compresses if lesions centered around eye and no involvement of forehead/scalp 9 TOPICAL ANTIVIRALS (e.g. -
An Algorithm to Detect Kayser-Fleischer Ring in Human Eye for Diagnosing Wilson Disease
ISSN: 2319-8753 International Journal of Innovative Research in Science, Engineering and Technology (An ISO 3297: 2007 Certified Organization) Vol. 3, Issue 5, May 2014 An Algorithm to Detect Kayser-Fleischer Ring in Human Eye for Diagnosing Wilson Disease 1S.Tharageshwari, 2 D.Sasikala 1PG scholar, Department Of ECE, Vivekanandha College of Engineering For Women, Namakkal , Tamil nadu, India. 2Associate Professor, Department Of ECE, Vivekanandha College of Engineering For Women, Namakkal, Tamil nadu, India. ABSTRACT-An eye image is segmented by JSEG (J measure based segmentation) algorithm without the manual parameter adjustment and simplifies texture and color for detecting the Kayser-Fleischer ring in diagnosing Wilson Disease. Segmentation with this algorithm passes through two major stages, namely color quantization and spatial segmentation as first stage and region growing and region merging as secondary stage. The biometric measurement provides information on the percentage of the extent of the cornea tissue affected from the copper accumulation. This algorithm detects the presence of symptoms reducing occurrence of false-negative diagnoses and improves accuracy of actual methods used in practice like slit lamp method. The described techniques reduces possible interpretation errors and assists doctor to diagnose the pathology. INDEX TERMS – Wilson disease, Kayser-Fleischer Ring, segmentation, Biometric measurement. I. INTRODUCTION Wilson disease is an autosomal recessive genetic disorder that prevent the body from getting rid of extra copper. A small amount of copper obtained from food is needed to stay healthy, but too much copper is poisonous. When the copper storage capacity of the liver is surpassed, copper is passed into the bloodstream and travels to the other organs-including the brain, kidney, and eyes. -
Effects of Nd:YAG Laser Capsulotomy in Posterior Capsular Opacification
Original Research Article Effects of Nd:YAG laser capsulotomy in posterior capsular opacification Praveen Kumar G S1, Lavanya P2*, Raviprakash D3 1Assistant Professor, 2Associate Professor, 3Professor & HOD, Department of Ophthalmology, Shridevi institute of Medical Sciences and Research Hospital, Sira Road, NH-4 Bypass Road, Tumkur- 572106, INDIA. Email: [email protected] Abstract Background: Posterior capsular opacification (PCO) is the most common long-term complication of cataract surgery in both phacoemulsification and extracapsular cataract extraction (ECCE). The overall incidence of PCO and the incidence of neodymium-doped yttrium–aluminum–garnet (Nd:YAG) laser posterior capsulotomy has decreased from 50% in the 1980s and early 1990s to less than 10% today. Reported complications of Nd:YAG laser posterior capsulotomy include elevated intraocular pressure, iritis, corneal damage, intraocular lens (IOL) damage, cystoids macular edema, disruption of the anterior hyaloid surface, increased risk of retinal detachment, and IOL movement or dislocation. In some patients, a refraction change is noticed after Nd:YAG laser posterior capsulotomy, but proving this remains difficult. Materials and Methods: Nd; YAG LASER capsulotomy was performed in 200 eyes of 200 patients, some with pseudophakia and some with aphakia at Kurnool medical college, Kurnool. They were followed up between October 2008 and September 2010. Results: Elevation of IOP has been well documented after anterior segment laser procedures. The IOP rise after YAG laser posterior capsulotomy is of short duration starting about 1 hr after laser procedure and lasting for 24 hrs. In this study, in 1case IOP came down to normal level after 3 days and in another case after 7 days. -
Changes in Ocular Rigidityin Endocrine Exophthalmos
Br J Ophthalmol: first published as 10.1136/bjo.42.11.680 on 1 November 1958. Downloaded from Brit. J. Ophthal. (1958) 42, 680. CHANGES IN OCULAR RIGIDITY IN ENDOCRINE EXOPHTHALMOS* BY R. WEEKERS AND G. LAVERGNE From the Ophthalmological Clinic, Lie'ge University Two types of endocrine exophthalmos are frequently distinguished, being referred to thyrotoxic or hyperthyroid exophthalmos, and thyrotropic, ophthahnoplegic, or oedematous exophthalmos. (a) Hyperthyroid or Thyrotoxic Exophthalmos.-This accompanies Graves's disease and is, therefore, much more frequently seen in females than in males. In the majority of cases the exophthalmos is quite unobtrusive or there is merely an appearance of exophthalmos due to retraction of the upper lid. It is associated with a decreased frequency of blinking and a fixed stare. The majority of authors agree that these symptoms should be attributed to an increase in tone of the sym- pathetic system. The importance of the pituitary thyrotropic hormone in thiscopyright. clinical picture is not clear. Hyperthyroid exophthalmos is not complicated either by chemosis or by diplopia, but heterophoria and lack of convergence are often seen. (b) Thyrotropic, Ophthalmoplegic, or Oedematous Exophthalmos.-This may occur either in a subject suffering from verified and treated hyperthyroidism, when the signs of thyrotoxicosis are about to disappear, or in an apparently normal subject free from any thyroid symptom or history of symptoms. The second type http://bjo.bmj.com/ is more frequently seen in males than in females. Thyrotropic exophthalmos is often very marked'and may even lead to irreducible lagophthalmos; it is invariably associated with a disturbance of ocular movements, particularly with elevation of the gaze. -
Peripheral Hypertrophic Subepithelial Corneal Degeneration Presenting
Eye (2015) 29, 88–97 & 2015 Macmillan Publishers Limited All rights reserved 0950-222X/15 www.nature.com/eye 1,2 3 4 CLINICAL STUDY Peripheral MSchargus , C Kusserow ,USchlo¨ tzer-Schrehardt , C Hofmann-Rummelt4, G Schlunck1 hypertrophic and G Geerling1,5 subepithelial corneal degeneration presenting with bilateral nasal and temporal corneal changes Abstract 1 Department of Purpose To characterise the history, clinical transmission electron microscopy showed Ophthalmology, University of Wuerzburg, Wuerzburg, and histopathological features of patients histological features that are similar to Germany with bilateral nasal and temporal peripheral Salzmann’s corneal changes without any hypertrophic subepithelial corneal inflammation. We hypothesise that light 2Department of degeneration in a German population. exposure and a localised limbal insufficiency Ophthalmology, University Methods A detailed ophthalmological and could be involved in the pathogenesis. of Bochum, Bochum, dermatological history and clinical findings Eye (2015) 29, 88–97; doi:10.1038/eye.2014.236; Germany were recorded of nine patients with bilateral published online 3 October 2014 3Department of simultaneous nasal and temporal peripheral Ophthalmology, University corneal degeneration from two centers in of Luebeck, Lu¨ beck, Germany. Excised tissues were studied by Introduction Germany histopathology, immunohistochemistry, and transmission electron microscopy. Salzmann’s nodules (SN) are subepithelial, 4 Department of Results Foreign body sensation and need elevated bluish-white corneal opacities of non- Ophthalmology, University inflammatory origin, with a specific peripheral of Erlangen-Nuernberg, of artificial tear substitutes were the only 1–7 Erlangen, Germany symptoms reported regularly. Schirmer’s and circular pattern. What has been termed Jones-test were normal in all, but fluorescein Salzmann’s degeneration is predominantly 5Department of break-up time of 410 s was found in five eyes unilateral, presenting at any time in life with Ophthalmology, University of four patients. -
Ophthalmology Abbreviations Alphabetical
COMMON OPHTHALMOLOGY ABBREVIATIONS Listed as one of America’s Illinois Eye and Ear Infi rmary Best Hospitals for Ophthalmology UIC Department of Ophthalmology & Visual Sciences by U.S.News & World Report Commonly Used Ophthalmology Abbreviations Alphabetical A POCKET GUIDE FOR RESIDENTS Compiled by: Bryan Kim, MD COMMON OPHTHALMOLOGY ABBREVIATIONS A/C or AC anterior chamber Anterior chamber Dilators (red top); A1% atropine 1% education The Department of Ophthalmology accepts six residents Drops/Meds to its program each year, making it one of nation’s largest programs. We are anterior cortical changes/ ACC Lens: Diagnoses/findings also one of the most competitive with well over 600 applicants annually, of cataract whom 84 are granted interviews. Our selection standards are among the Glaucoma: Diagnoses/ highest. Our incoming residents graduated from prestigious medical schools ACG angle closure glaucoma including Brown, Northwestern, MIT, Cornell, University of Michigan, and findings University of Southern California. GPA’s are typically 4.0 and board scores anterior chamber intraocular ACIOL Lens are rarely lower than the 95th percentile. Most applicants have research lens experience. In recent years our residents have gone on to prestigious fellowships at UC Davis, University of Chicago, Northwestern, University amount of plus reading of Iowa, Oregon Health Sciences University, Bascom Palmer, Duke, UCSF, Add power (for bifocal/progres- Refraction Emory, Wilmer Eye Institute, and UCLA. Our tradition of excellence in sives) ophthalmologic education is reflected in the leadership positions held by anterior ischemic optic Nerve/Neuro: Diagno- AION our alumni, who serve as chairs of ophthalmology departments, the dean neuropathy ses/findings of a leading medical school, and the director of the National Eye Institute. -
Its Not Just Dry Eye NCOS2021
5/31/21 DISCLOSURES CORNEA ENDOTHELIOPATHIES NOPE, THAT’S NOT JUST DRY EYE: PRIMARY SECONDARY OTHER CORNEAL DISEASES • Corneal guttata • Contact lens wear • Fuchs dystrophy • Surgical procedures • Posterior Polymorphous Dystrophy (PPD) • Age related Cecelia Koetting, OD FAAO • Congenital hereditary endothelial dystrophy • Iatrogenic (im munodeficiency) (CHED) • Glaucoma induced Virginia Eye Consultants • Iridocorneal endothelial syndrome (ICE) • Ocular inflammation Norfolk, VA 1 2 3 OTHER CORNEAL CORNEAL FUNCTION • Keratoconus • Central cloudy dystrophy of Francois • Pellucid marginal degeneration • Thiel-Behnke corneal dystrophy • Shields the eye from germs, dust, other harmful matter • Lattice Dystrophy • Ocular Bullous pemphigoid WHY IS THE CORNEA IMPORTANT? • Contributes between 65-75% refracting power to the eye • Recurrent corneal erosion (RCE) • SJS • Filters out some of the most harmful UV wavelengths • Granular corneal dystrophy • Band Keratopathy • Reis-Bucklers corneal dystrophy • Corneal ulcer • Schnyder corneal dystrophy • HSV/HZO • Congenital Stromal corneal dystrophy • Pterygium • Fleck corneal dystrophy • Burns/Scars • Macular corneal dystrophy • Perforations • Posterior amorphous corneal dystrophy • Vascularized cornea 4 5 6 CORNEAL ANATOMY CORNEA Epithelium Bowmans Layer • Cornea is a transparent, avascular structure consisting of 6 layers • A- Anterior Epithelium: non-keratinized stratified squamous epithelium; cells migrate from BRIEF ANATOMY REVIEW Stroma basal layer upward and periphery to center • B- Bowmans Membrane: -
Miotics in Closed-Angle Glaucoma
Brit. J. Ophthal. (I975) 59, 205 Br J Ophthalmol: first published as 10.1136/bjo.59.4.205 on 1 April 1975. Downloaded from Miotics in closed-angle glaucoma F. GANIAS AND R. MAPSTONE St. Paul's Eye Hospital, Liverpool The initial treatment of acute primary closed-angle Table i Dosage in Groups I, 2, and 3 glaucoma (CAG) is directed towards lowering intraocular pressure (IOP) to normal levels as Group Case no. Duration IOP Time rapidly as possible. To this end, aqueous inflow is (days) (mm. Hg) (hrs) reduced by a drug such as acetazolamide (Diamox), and aqueous outflow is increased via the trabecular I I 2 8 5 meshwork by opening the closed angle with miotics. 3 7 21 3 The use of miotics is of respectable lineage and hal- 5 '4 48 7 lowed by usage, but regimes vary from "intensive" 7 8 I4 5 9 I0 I8 6 (i.e. frequent) to "occasional" (i.e. infrequent) instilla- I I 2 12 6 tions. Finally, osmotic agents are used after a variable '3 5 20 6 interval of time if the IOP remains raised. Tlle pur- I5 '4 I8 6 pose of this paper is to investigate the value of '7 '4 i6 6 miotics in the initial treatment of CAG. I9 6 02 2 2 2 8 2I 5 Material and methods 4 20t 20 6 Twenty patients with acute primary closed-angle glau- 6 I i8 5 http://bjo.bmj.com/ coma were treated, alternately, in one of two ways 8 4 i8 5 detailed below: I0 6 I8 6 I2 I0 20 6 (I) Intravenous Diamox 500 mg.