The process begins with the patient positioning their chin on the chin rest and resting their forehead against a support. This ensures the patient''s head remains stable throughout the examination.

The objective lens system within the autorefractor aligns with the patient''s eyes, allowing the machine to focus on the specific area of interest. The optometrist adjusts the machine for accurate alignment, ensuring optimal measurements.

Once alignment is achieved, the autorefractor emits a beam of light that enters the patient''s eye. The light rays are reflected from the retina and refracted by the eye''s internal structures.

The optical sensors within the autorefractor record the reflected light rays and analyze their properties. By examining factors such as the eye''s movement and direction of light, the machine determines the refractive error.

Using the collected data, the autorefractor''s internal processor performs complex calculations to determine the patient''s refractive error. It takes into account the amount and direction of light refraction, generating accurate measurements for myopia, hyperopia, astigmatism, or presbyopia.

After the calculations, the autorefractor presents the results on its display screen. The measurements are typically expressed in diopters, indicating the corrective lens power required to treat the patient''s refractive error accurately.