Term
| CORNEAL INMUNOPATHOLOGIC REACTION: |
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Definition
| ATOPIC REACTIONS, CONTACT ALLERGIC REACTIONS, ALLERGIC REACTION TO MICROBIAL ANTIGENS, |
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Term
| OTHER CAUSES OF CORNEAL INFLAMMATION |
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Definition
| MOREN’S ULCER, ROSACEA KERATITIS, CORNEAL TRANSPLANTATION, , EUROTROPHIC KERATITIS, EXPOSURE KERATITIS, KERATOMALACIA, KERATOCONJUNCTIVITIS SICCA |
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Term
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Definition
| CORNEAL FOREIGN BODY, ABRASIONS, LACERATIONS |
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Term
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Definition
| These are a type of immediate hypersensitivity in humans resulting from spontaneous sensitization . It can be associated with ingest or inhaled material, foods or drugs or a complication of eczema. A superficial KERATITIS AND/OR OPACIFICATION OF THE STROMA can result. This reaction have been associated with KERATOCONUS.** 6.32 |
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Term
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Definition
| This is usually associated with allergy dermato-conjunctivitis, but corneal manifestations might predominate. Anesthetics and ophthalmic drugs are often implicated. Severe keratitis and involvement of the deep layers can result. **3.30-31 |
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Term
| ALLERGIC REACTION TO MICROBIAL ANTIGENS |
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Definition
| The corneal reaction can be variety in dependence to a causal germen: |
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Term
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Definition
| in congenital syphilis produce INTERTITIAL keratitis(Salmon patches) **6.58 , *6.30 |
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Term
| Stphylococcus Aureus produce what type of kerto conjunctivitis |
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Definition
| PHYCTENULAR keratoconjunctivitis and is the most common cause of this type of lesions characterized by small blisters or vesicles over the conjuntiva or cornea. |
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Term
| Adenovirus type 8 is responsible to |
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Definition
| the subepithelial opacities that occur in EKC **4.7-8 |
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Term
| Thygeson’s Superficial punctate keratitis |
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Definition
| .Noncontagious ,usually bilateral, unknown etiology**6.61 |
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Term
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Definition
| Corneal ulceration which begin at the limbus and progresses due to autoimmune lysis of the epithelium,with release of collagenolytic enzymes, may result in the ulcer formation: produce pain, photophobia and blurred vision due to induced astigmatism. **6.62 Recent studies suggest that autoimmunity against an antigen in corneal stroma is probably triggered by trauma in genetically susceptible individuals Ttt: is unsuccessful, but removal of the antibody by excision, cryotherapy of the conjunctiva and others techniques retards the progression . |
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Term
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Definition
| Chronic hyperemic disease of the skin ,that affects the nose, forehead, and cheeks. Corynebacterium acne eats oil and breaks it down into the fatty acids which are iritative to the skin , producing also blepharitis, meibomianitis , chalazion sties and diffuse hyperemia of the conjunctiva. Keratitis involves the lower two thirds of the cornea there is peripheral vascularization and sub-epithelial infiltrates, and thinning. Itching , burning and foreign body sensation are frequent symptoms. Ttt: Tetracycline for secondary infection. ** 4.48-49 |
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Term
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Definition
| (keratoplastia) It can be TOTAL (entire cornea) PARTIAL (central portion of the cornea but all layers) and LAMELLAR ( only the superficial layer of the cornea are removed and replace ).Rejection can occur at the epithelial, stromal or endothelial level. Corneal transplantation enjoys a high rate of success since the cornea is avascular and lymphatics are absent **6.80*-81 |
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Term
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Definition
| corneal inflammation that arises because of anesthesia of the cornea, which permits trauma and desiccation of the corneal epithelium without reflex protection. Palsy trigeminal nerve is the most frequent cause due to a corneal dismetabolism. No pain but conjunctiva is injected. VA can be decresed. Ttto Tarsorrhaphy ( closed the eyelids by temporal suture) before severe corneal damage or ulcers.**5.40-41 |
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Term
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Definition
| This an corneal inflammation cause by the failure of the eyelids to cover completely the globe, frequently associated to a Bell’s palsy or exophthalmos. The epithelium became necrotic and the cornea can be invade by secondary infection from the conjunctival flora or others germens. Pain, ciliary injection and staining of the cornea. Ttto prevention of infection or even tarsorrhaphy.* *20.24 |
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Term
| What is frequently associated toexposure Keratitis |
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Definition
| Bell’s Palsy or exophthalmos |
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Term
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Definition
| This is a softening of the cornea due to a deficiency in vitamin A Xerophthalmia ( more severe stage) night blindness, faulty bone grow with optic nerve compression in the optic canal ,can occur, as well as Bitot’s spots. It can be general or localized and can lead to destruction of the eye. Ttto 50,000 to 100,000 unities Vit A per day **5.45 to 48 |
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Term
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Definition
| Corneal foreign bodies constitute about 55% or more of all significant eye injuries.( remember the epithelium layer is a barrier to prevent germens enter into the cornea) and the reaction against the foreign body produce symptoms.** 6.46 |
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Term
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Definition
| are scraping away of the surface of the cornea ,usually involving only the superficial layers, no deeper than Bowman’s membrane. If secondary infection occur, ulcer or abscess can developed. They can be caused by F.B. ,traumas, chemical or thermal burns, contact lenses becoming a common cause . Ttto. Prevention the infection **3.33 to 37 |
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Term
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Definition
| Involved deeper layers, obviously, are more seriously than abrasions, and can leaves opacities forever. Its need to be explore carefully. Ttto. Prevention of infection by use of topical antibiotics or suture if it is necessary. **2.68 |
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