American Board of Opticianry (ABO) Practice Test 2026 – The All-in-One Guide to Master the American Board of Opticianry Exam!

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What does keratitis refer to?

Inflammation of the cornea

Keratitis refers to inflammation of the cornea, the clear, dome-shaped surface that covers the front of the eye. This condition can be caused by infection, injury, or underlying medical conditions and can lead to redness, pain, and blurred vision. Option B refers to the geometric center which is not related to the term keratitis. Option C refers to the power of the eye's refractive system, not an inflammatory condition. Option D is a description of the boxing system and its measurements, not related to keratitis.

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Geometric center

Provides approximately 43 diopters of power to an eye's refractive system

The point where lines that bisect the horizontal and vertical measurements of the lens in the boxing system intersect

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