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The Concept of Corneal Protection

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The Concept of Corneal Protection patient support OPHTHALMOLOGY Kirk N. Gelatt, VMD, University of Florida The Concept of Corneal Protection Corneal protection entails covering, or shielding, the cornea from injury or exposure. It also involves maintenance of status or integrity. When corneal protection is considered clinically, all tissues involving the orbit, eyelids, conjunctiva and nictitans, lacrimal gland tear production, and drainage system contribute to the cornea’s well-being and must be evaluated. n purebred dogs, outer eye diseases and corneal protection issues are often associated with inherited predisposing abnormalities, such as shal - Ilow orbits, exophthalmos, lagophthalmia, entropion and ectropion, and keratoconjunctivitis sicca (KCS). In cats, inherited predisposing abnor - malites are less frequent but include exophthalmos and entropion in the brachycephalic breeds. Infectious diseases in cats seem to play a more frequent role than inherited diseases in corneal protection issues. The cornea can be conveniently examined with good magnification and illumination. Inspection of the outer eye occurs during pres - entation for diagnosis and also following medical and surgical therapies. The cornea is quite resilient and, despite signifi - cant challenges to its clarity and integrity, often responds successfully to treatment, thereby maintaining vision. 22 ..... NAVC clinician’s brief . december . 2009 ................................................................................................................... patient support Diagnostics The accessibility of the cornea permits many dif - Corneal Anatomy ferent types of diagnostic analysis, most of which To understand the concept of corneal protection, the interrelationships of the precorneal can be performed in the examination room. tear film, cornea, conjunctiva (including the nictitating membrane), and the eyelids must be understood. Eyelid Function The precorneal tear film is the first line of defense in corneal protection. If it is adversely Eyelid function can be determined by observing altered, disease results. The film consists of 3 layers, each of different chemical compositions. the rate and quality of blinking, the interrela - • The oily/lipid outer layer is produced by the meibomian glands, located within the tionships between the lids and conjunctivae, and tarsal layer of the eyelids. Its primary function is to prevent evaporation of the deeper tear film layers. the presence of any eyelid abnormalities. Both corneal and conjunctival sensation via the oph - • The aqueous middle layer is produced by the lacrimal gland and superficial gland of the nictitans. It is the thickest layer and contains the majority of corneal nutrients. Insuffi - thalmic division of the trigeminal nerve is essen - cient production of the aqueous portion of the tear film results in KCS, the most common tial for precorneal tear film health. Likewise, secondary conjunctivitis in dogs. innervation by the palpebral branch of the facial • The mucoid deep layer is produced by the conjunctiva’s goblet cells, which are concen - nerve is essential for orbicularis oculi muscle trated within the nasal, especially the ventral, conjunctival fornices. action and the palpebral reflex. Corneoconjunctival protection is in jeopardy retraction of the globe and protrusion of the outer cornea but also the palpebral and bulbar when sensation and lid mobility are impaired. nictitans. conjunctivae and nictitans surfaces. Normal dog and cat blink rates are 3 to 12 blinks per minute and 1 to 3 blinks per 5 min - The Cochet-Bonnet esthesiometer is an improved Fluorescein Staining utes, respectively. These blinks are often (up to method for not only detecting but also quantify - The lipid outer layer is evaluated by tear break- 70%) incomplete. Blinks in both species often ing sensitivity of the cornea in its different quad - up time (BUT). With this technique, fluorescein occur in both eyes simultaneously, and excited rants and center. This device, shaped like a stain is applied to the dorsal bulbar conjunctiva animals may blink excessively (most likely due fountain pen, has an adjustable semitransparent while holding the eyelids open and observing to excessive sympathetic tone). Evaluation of the fiber protruding from its end, which helps deter - the corneal surface with a cobalt blue light palpebral reflex response not only includes mine the level of corneal sensation. The shorter source and magnification. The time for the presence or absence of the response; but also the protruding filament that induces a response, development of dry spots in the tear film is the evaluation of the speed, rigor, and ability to the less sensitive the cornea. BUT. Normal BUT in the dog is 20 ± 5 seconds maintain closure of the lids. Diseases that affect and in the cat, 17 ± 4 seconds. blinking are often slow in onset; both speed and Brachycephalic dogs and cats, diabetic animals, extent of blinking are gradually affected before older animals, and foals appear to have In addition, application of fluorescein stain dur - total loss of function results. Both the dazzle decreased corneal sensitivity. In brachycephalic ing the ocular exam allows corneal evaluation. reflex and menace response can also help deter - dogs, the central corneal sensitivity is reduced, During this test, the stain is applied to the dorsal mine eyelid function. which combined with a thin central precorneal bulbar conjunctiva from a moistened dye strip tear film, may predispose these breeds to cen - and is distributed across the cornea by the Corneal Sensitivity tral corneal ulceration. patient’s eyelids. Evaluation of fluorescein reten - Corneal sensitivity is most often tested by touch - tion should occur immediately thereafter, as the ing the cornea and/or conjunctiva with a cotton Corneal & Conjunctival Health dye can rapidly traverse the exposed corneal wisp while holding the eyelids open. The swab’s To evaluate the corneal and conjunctival health, stroma and enter the anterior chamber. Since tip must be small and the cornea touched from several diagnostics can be employed, based in damaged corneal epithelium or recently reat - the lateral side to decrease likelihood of a men - part on the 3 different layers of the precorneal tached epithelium may stain very faintly, close ace response. A positive sensitivity response is tear film; this film covers not only the entire observation of the corneal surface with BUT = break-up time; KCS = keratoconjunctivitis sicca continues patient support ................................................................................................................... NAVC clinician’s brief . december . 2009..... 23 patient support CONTINUED magnification and a cobalt blue light is essential. apy is indicated. Delayed or intermittent topical The cornea should be rinsed following applica - therapy may allow immune-mediated dacryoad - tion of fluorescein to prevent false positives due enitis to advance, promote greater gland destruc - to stain pooling. tion, and decrease future drug efficacy. Schirmer’s Tear Test (STT) Tear replacements (both liquid and ointments) The aqueous layer is tested by STT 1 and 2. STT can provide corneal protection; however, since 1 measures both reflex and basal tear secretion; their contact times vary from minutes to a few however, it only measures the aqueous fraction 1 hours, their benefits are limited. Generic min - eral oil ointments have the longest corneocon - of the tear film. Normal range (mean ± SD) in Generalized corneal epithelial rose bengal retention dogs is 18 to 24 ± 4 to 5 mm wetting/minute in in an eye with lagophthalmia, previous descemeto - junctival contact times. In humans, vision dogs; in cats, it is 14 to 17 ± 5 to 6 mm. Values cele, and pedicle conjunctival graft blurring is a major problem, but in animals this are more variable in cats; some have low values appears less important. and no ocular disease. However, other patients, such as young brachy - Medical corneal protectors tested experimen - cephalic dogs with previous bilateral corneal For STT 2, topical anesthesia is applied and the tally include biogradable tear inserts and ulcerations, brachycephalic dogs with only one conjunctival sac is dried with a Dacron swab; lacrimal punctal implants (or plugs) that eye, and those with central rose bengal stain test paper is inserted into the conjunctival fornix increase tear formation rate by either increasing retention and low-normal STT rates (about 10 of the mid lower lid for 1 minute. This test esti - available tears or preventing tear drainage. mm wetting/minute) are also candidates. mates only basal tear secretion. STT 2 in the dog Other devices include collagen shields and con - ranges from 3.8 ± 2.7 to 13.95 ± 4 mm wet - tact lenses. Some of these devices may also serve Current topical drugs that may increase STT 1 ting/minute; in cats it is 80% of the STT 1 levels. as reservoirs to release medications over time. levels include cyclosporine, tacrolimus, and pimecrolimus in patients with KCS. Drug concen - As the most frequent cause of secondary con - Surgical Protection trations, frequency of instillation, and stage of junctivitis, KCS in dogs is associated with aque - There are several surgical eyelid procedures that KCS may affect drug efficacy. If one drug fails to ous tear deficiency. Routine use of STT is impor- promote corneal protection. In some patients, adequately increase tear formation rates and tant in diagnosing early disease, when medical these are the most cost-effective
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