An autorefractor is a computerized machine used in optometry and ophthalmology clinics

to measure an individual's refractive error and determine the appropriate prescription for

corrective lenses such as eyeglasses or contact lenses. The device works by projecting a series

of images or patterns onto the retina of the patient's eye and analyzing the reflected light to

calculate the eye's curvature and focus. This information is then used to generate an accurate

prescription for vision correction. Autorefractors are particularly useful for quickly and accurately

diagnosing visual acuity problems, such as nearsightedness, farsightedness, and astigmatism.