Astigmatism is diagnosed by an optometrist by studying the way light is refracted on a dilated, or wide, pupil. Light refraction is the way that light bends when making contact with the curved surfaces of the eye. With astigmatism, the changing surfaces of the cornea or lens cause light to bend irregularly. The optometrist can use a keratometer to measure refraction or a keratoscope to measure the spacing of projected rings and calculate the irregularity of the surface of the cornea or lens. Once the doctor knows the level of astigmatism, they can recommend the proper treatment plan of corrective lenses or eye surgery.
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Honor Society of Nursing (STTI) answered
Johns Hopkins Medicine answeredA standard eye exam is used to diagnose astigmatism. This is done with a test called retinoscopy. The examiner focuses a light into the using a series of corrective lenses. Astigmatism can also be diagnosed by automated refraction or photoscreening devices. These are instruments that project a light into the eye, using the effect to determine the refractive error.