Certified Ophthalmic Assistant Practice Exam

The instrument that measures the curvature of the central part of the cornea is the

1. Keratometer

2. Lensmeter

3. Phoropter

4. Ophthalmoscope

The correct answer is: Keratometer

The keratometer is the instrument most commonly used by optometrists and ophthalmologists to measure the curvature of the cornea, which is the clear, dome-shaped surface that covers the front of the eye. This measurement is important in determining the proper fit for contact lenses and diagnosing certain eye conditions. Option B, the Lensmeter, is used to measure the power and prescription of glasses lenses, not the curvature of the cornea. Option C, the Phoropter, is used to determine an individual's refractive error and determine the right prescription for glasses or contact lenses, but it does not directly measure the curvature of the cornea. Option D, the Ophthalmoscope, is used to examine the internal structures of the eye, such as the retina and optic nerve, and is not used to measure the curvature of the cornea.