Certified Ophthalmic Assistant Practice Exam 2026 – All-in-One Guide to Exam Success!

Keratometry is the correct answer because it is a test specifically designed to measure the curvature of the cornea, which is essential in diagnosing astigmatism. Astigmatism is a refractive error caused by irregularities in the curvature of the cornea or lens of the eye, leading to distorted or blurred vision at all distances. By measuring the curvature of the cornea, keratometry can help quantify the degree and axis of astigmatism, aiding in the accurate prescription of corrective lenses and management of the condition.

The other options are not used for identifying astigmatism:

- Slit lamp examination is a tool used for examining the structures of the eye under magnification, but it is not specifically focused on diagnosing astigmatism.

- Goldmann tonometry and applanation tonometry are both techniques used to measure intraocular pressure and are not related to the identification of astigmatism.