autorefraktormåling

Autorefraktormåling, often referred to as an autorefractor or an automated refractor, is an eye examination instrument that determines the refractive error of a person's eyes. Refractive error is the inability of the eye to focus light properly on the retina, leading to blurred vision. Common refractive errors include myopia (nearsightedness), hyperopia (farsightedness), and astigmatism.

The autorefractor works by projecting light into the eye and measuring how it is reflected back. This is typically done through a process of shining a beam of light or a series of fogged images onto the patient's retina. The instrument then analyzes the light that returns, assessing how it has been bent or focused by the cornea and lens of the eye. Based on this analysis, the autorefractor calculates the necessary prescription to correct the refractive error, measured in diopters.

This non-invasive test is quick and painless. It provides an objective measurement of the refractive error, meaning it doesn't rely on the patient's subjective responses, which can be helpful for individuals who have difficulty communicating, such as young children or those with certain disabilities. While the autorefractor provides a baseline measurement, it is important to note that the results are usually confirmed and refined by an optometrist or ophthalmologist through a subjective refraction, which involves asking the patient which lens provides clearer vision. Autorefraktormåling is a standard piece of equipment in most optometric and ophthalmological practices.