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How is astigmatism diagnosed?

Dr. Jeanne Morrison, PhD
Family Practitioner

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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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.