Certified Paraoptometric (CPO) Practice Exam

A retinoscope is primarily used for refraction assessment, which is the process of determining the appropriate prescription for corrective lenses. This tool works by shining a beam of light into the eye, allowing the clinician to observe the reflection (or reflex) of light off the retina. As the light moves, adjustments in the lens are made to observe how the reflex changes in relation to different lens powers. This technique enables the eye care professional to evaluate the eye's refractive error—whether it is myopic (nearsighted), hyperopic (farsighted), or astigmatic.

In contrast, color vision testing is conducted to assess a patient's ability to perceive different colors, which does not involve a retinoscope. Ocular pressure measurement is typically done using tonometry, a different method altogether that evaluates intraocular pressure to check for conditions like glaucoma. Fundus examination requires specialized equipment such as an ophthalmoscope to visualize the interior surface of the eye, which includes the retina, and is not performed with a retinoscope. Therefore, the role of the retinoscope is specific to assessing refraction, making it the correct answer in this context.