1. Chemical burns:
a. acid solution readily penetrate the corneal epithelium
but are repelled by the lipoprotein cell walls of
the
lkeratocytes
b. alkaline corneal burns are less destructive than acid
burns
c. solutions of alkaline pH readily penetrate and spread
deep into the corneal stroma and into the anterior
chamber
d. acid burns of the cornea are usually sharply
demarcated because of the buffering action fo the
tissues
e. refrigerant and bleach are common causes of alkali
burns
2. The Kayser-Fleischer ring:
a. consists of copper deposits in Bowman's membrane
b. gives a green-brown, grey, orange or brown
appearance tot he corneal periphery
c. initially appears as a thin crescent at the 3 and 9
o'clock positions of the cornea
d. may regress with D-penicillamine therapy
e. cannot result from copper intraocular foreign bodies
3. Cogan's syndrome is:
a. a form of acquired syphilis
b. characterized by deafness
c. occasionally associated with lupus erythematousus
d. occasionally associated with polyarteritis nodosa
e. characterized by interstitial keratitis
4. Causes of aqueous tear deficiency:
a. practolol
b. tricyclic anti-depressants
c. facial nerve palsy
d. antihistamines
e. atropine
5. Mucopolysaccharidoses associated with corneal clouding:
a. Hurler
b. Hunter
c. Scheie
d. Morquio
e. Sanfilippo
6. Keratoconus:
a. should be suspected in an adolescent with progressive
myopic astigmatism
b. does not exhibit corneal epithelial thinning
c. is accompanied by Bowman's membrane
d. may be associated with Vogt's striae which are fine
vertical folds in the deep stroma
e. can be optically corrected with hard contact lenses
7. Causes of chronic conjunctivitis:
a. chlamydial infection
b. cosmetics
c. molluscum contagiosum
d. chronic meibomitis
e. psoriasis
8. Bilateral corneal crystalline deposits may occur in:
a. cystinosis
b. gout
c. monoclonal gammopathy
d. Salzmann's dystrophy
e. Schnyder's dystrophy
9. Indications for a larger donor button in keratoplasty:
a. phakic patient
b. shallow anterior chamber
c. peripheral corneal thinning
d. prior history of uveitis
e. aphakic patient
10. Exclusion criteria for donor cornea:
a. previous intraocular surgery
b. retinoblastoma
c. death of unknown cause
d. bowel cancer
e. Creutzfeldt-Jakob disease