Corneal Infections and Hypersensitivities Flashcards
Acanthamoeba Keratitis Cause
CL rinsed with tap water
Symptoms of Acanthamoeba Keratitis
pain worse than clinical appearance
Signs of Acanthamoeba Keratitis
grayish irregular corneal surface- infiltrates
stromal opacification/ vascularization
corneal melt
Diagnosis of Acanthamoeba Keratitis
consider when pain worse than appearance and when there is a limited response to antibiotics
Tx of Acanthamoeba Keratitis
debridement
topical amoebicides
referal to K specialist
Onchocerciasis Keratitis Cause
worm from black fly bite
Marginal Keratitis
Hypersensitivity to Staph exotoxins and cell wall proteins
Signs of Marginal Keratitis
peripheral/ marginal K infiltrates separated from limbus by clear zone
nearby conjunctival hyperemia
Tx for Marginal Keratitis
self resolves
treat associated blepharitis
topical steroid +/- antibiotic
Phlyctenular Keratitis
Nodular inflammation of cornea resulting from hypersensitivity rxn to foreign antigen- S. aureus, M. tuberculosis…..
Demographics for Phlyctenular Keratitis
6mo to 16 yrs
Signs of Phlyctenular Keratitis
white limbal nodule that can extend further onto cornea
intense nearby conjunctival hyperemia
Tx for Phlyctenular Keratitis
spontaneously resolve, leaving scar, vascularization, thinning; but can ulcer
topical steroids
treat blepharitis
Rosacea
sun exposed skin characterized by telangectasia, papule formation, rhinophyma, facial flushing
Signs of Ocular Rosacea
marginal telangectasia of lids and MGD conjunctival inflammation punctate K epithelial erosions inferiorly marginal keratitis K thinning K scarring/ NV