Corneal Anatomy and Physiology — Flashcards

Flashcard 1: Corneal thickness indirectly reflects _____ function

Answer: endothelial

Flashcard 2: Which layer is the toughest in the cornea?_____

Answer: Dua's layer (toughest layer)

Flashcard 3: _____ membrane is the acellular superficial layer of the corneal stroma formed from collagen fibers.

Answer: Bowman s

Flashcard 4: Which two glycosaminoglycans (GAGs) play a role in corneal transparency?

Answer: Keratan sulfate and dermatan sulfate

Flashcard 5: The corneal layer involved in Grayson-Wilbrandt dystrophy is _____ membrane.

Answer: Bowman s

Flashcard 6: Contact lenses _____ corneal oxygen supply.

Answer: decrease

Flashcard 7: Which stain is used to identify granular dystrophy of the cornea? _____

Answer: Masson's trichrome

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

Answer: keratoconus

Flashcard 9: The following result on Placido disk test will be seen in _____

Answer: corneal astigmatism

Flashcard 10: 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).