Certified Ophthalmic Assistant Practice Exam

The autorefractor is a device used to measure a patient's refractive error by analyzing the way light is focused on the retina. It can help in determining the power of lenses needed to correct refractive errors such as myopia (nearsightedness), hyperopia (farsightedness), and astigmatism.

While the autorefractor is essential for assessing the refractive error, determining best-corrected visual acuity (BCVA) is not its primary function. The BCVA is typically evaluated by having the patient read an eye chart with different sizes of letters and is commonly done by using a phoropter or trial frame, not an autorefractor.