Certified Ophthalmic Assistant Practice Exam

A triangular thickening of the conjunctiva that partially covers the cornea is known as?

1. Pterygium

2. Pinguecula

3. Conjunctival cyst

4. Corneal ulcer

The correct answer is: Pterygium

The correct answer, which identifies a triangular thickening of the conjunctiva that partially covers the cornea, is indeed pterygium. A pterygium is characterized by a fleshy growth that tends to originate from the conjunctiva, extending onto the cornea. It is often associated with prolonged exposure to sunlight, dust, and wind, commonly occurring in individuals who spend significant time outdoors. In contrast, pinguecula is a similar conjunctival condition but is typically yellow and remains localized on the conjunctiva without encroaching onto the cornea. Conjunctival cysts are fluid-filled sacs that occur on the conjunctiva and have a different presentation, while a corneal ulcer represents an open sore on the cornea itself, typically related to infections or trauma. Each of these conditions has its own unique characteristics that differentiate them from pterygium.