ABO Ophthalmology Complete Practice Exam 2026

A visual field test primarily evaluates the extent of a person's peripheral vision. This test measures how far out to the sides, above, and below a person can see while focusing straight ahead. It helps identify blind spots and any peripheral vision loss, which can be an early indication of conditions such as glaucoma, retinal disease, or neurological issues.

The other options do not pertain to the primary function of a visual field test. Color blindness is assessed through different types of tests that evaluate color perception rather than visual field extent. Depth perception measures the ability to judge distances, which typically involves binocular vision and three-dimensional cues rather than peripheral detection. Corrective lens strength is evaluated through refraction tests that determine the necessary lens prescription to correct refractive errors and is unrelated to peripheral vision assessment. Thus, option C is the most accurate representation of what the visual field test measures.