Certified Paraoptometric Practice Test

What is the function of an autorefractor in an eye exam?

1. To measure intraocular pressure

2. To assess visual field

3. To provide an objective measurement of refractive error

4. To evaluate the health of the optic nerve

The correct answer is: To provide an objective measurement of refractive error

An autorefractor plays a significant role in the eye examination process by providing an objective measurement of refractive error. It uses automated technology to evaluate how light is being focused in the eye, thereby determining whether the patient is nearsighted, farsighted, or has astigmatism. This measurement is crucial for determining the appropriate prescription for glasses or contact lenses. By providing a baseline refractive reading, the autorefractor helps streamline the examination process, allowing eye care professionals to confirm or refine the results during subjective refraction tests, where the patient actively participates in determining their visual acuity. The other functions mentioned, such as measuring intraocular pressure or evaluating the health of the optic nerve, are performed using different specialized equipment and techniques, which are essential for diagnosing conditions like glaucoma or optic nerve disorders but do not relate directly to assessing refractive error. Similarly, visual field assessments focus on peripheral vision and do not measure refractive error. Thus, the autorefractor specifically fulfills the need for objective assessment of how well a person’s eye can focus light, making it a vital tool in the optometric field.