Protozoan Keratitis — Flashcards

Flashcard 1: Pain is disproportionate to degree of keratitis in _____ due to perineural involvement

Answer: acanthamoeba

Flashcard 2: Stromal/Disciform keratitis is a feature of _____ herpes simplex

Answer: secondary (primary/secondary)

Flashcard 3: _____ is the treatment of choice for acanthamoeba keratitis.

Answer: Polyhexamethyl biguanide (PHMB)

Flashcard 4: Which stain is used to identify avellino dystrophy of the cornea?_____

Answer: Congo-red and Masson's trichrome

Flashcard 5: _____ is the commonest cause of infectious keratitis after corneal transplantation in developing countries.

Answer: Staphylococcus epidermidis

Flashcard 6: Which stain is used to identify granular dystrophy of the cornea? _____

Answer: Masson's trichrome

Flashcard 7: The following result on Placido disk test will be seen in _____

Answer: keratoconus

Flashcard 8: The following result on Placido disk test will be seen in _____

Answer: corneal astigmatism

Flashcard 9: What are the common causes of interstitial keratitis? (Consider granulomatous, protozoal, and mycobacterial causes)

Answer: • Syphilis (most common cause) • Tuberculosis • Leprosy • Acanthamoeba • Cogan syndrome • Lyme disease

Extra: Clinical features of interstitial keratitis include a 'salmon patch' appearance (active stage) and 'ghost vessels' (healed stage). Cogan syndrome is a rare systemic disease characterized by interstitial keratitis and vestibuloauditory symptoms (vertigo, tinnitus, and sensorineural hearing loss).

Flashcard 10: Corneal thickness is best measured by a _____

Answer: pachymeter