Cornea & Conjunctiva

Topics in this chapter

• Corneal Structure and Physiology
• Keratitis and Corneal Infections
• Corneal Ectasia and Degenerations
• Conjunctival Disorders
• Dry Eye and Tear Testing
• Glaucoma-Related Corneal Signs

Practice questions

1. Question 1Q-8B772C

   A 24-year-old contact lens wearer presents with severe eye pain, photophobia, and a foreign body sensation. Examination reveals a ring-shaped corneal stromal infiltrate and a painful epithelial defect. Confocal microscopy shows highly reflective double-walled cysts. What is the most appropriate management?

   1. A.Topical Natamycin 5%
   2. B.Topical Polyhexamethylene biguanide (PHMB) 0.02% with Chlorhexidine 0.02%
   3. C.Topical Valganciclovir
   4. D.Intravitreal Amphotericin B
   See the answer and solution
2. Question 2Q-6B3087

   A 68-year-old male presents with a progressive, painless, white opacification of the peripheral cornea in his right eye. Slit-lamp examination shows a band-like grey-white opacity in the interpalpebral zone of the superficial cornea, separated from the limbus by a clear interval of Vogt. What is the most likely diagnosis?

   1. A.Band keratopathy
   2. B.Arcus senilis
   3. C.Salzmann nodular degeneration
   4. D.Terrien marginal degeneration
   See the answer and solution
3. Question 3Q-88E779

   During an evaluation for dry eye syndrome, a patient undergoes Schirmer's test. Without topical anesthesia, a reading of wetting of the filter paper of less than how many millimeters in 5 minutes is generally considered abnormal and diagnostic of aqueous tear deficiency?

   1. A.Less than 15 mm
   2. B.Less than 10 mm
   3. C.Less than 5 mm
   4. D.Less than 20 mm
   See the answer and solution
4. Question 4Q-693B7C

   A 30-year-old male presents with recurrent episodes of painful red eye, decreased vision, and photophobia. Examination reveals a stromal keratitis with deep vascularization, interspersed with areas of stromal thinning, and a 'salmon patch' appearance. Which of the following systemic conditions is most likely associated with this presentation?

   1. A.Congenital Syphilis
   2. B.Herpes Simplex Virus
   3. C.Rheumatoid Arthritis
   4. D.Wegener granulomatosis
   See the answer and solution
5. Question 5Q-2AD359

   A patient with severe microbial keratitis is evaluated for impending corneal perforation. Which of the following layers of the cornea is the thickest?

   1. A.Epithelium
   2. B.Bowman's layer
   3. C.Stroma
   4. D.Descemet's membrane
   See the answer and solution