How Do You Test for Astigmatism?

To test for astigmatism, doctors typically perform a vision test, measure the curvature of the patient's cornea and measure the light focus of the eye, according to Mayo Clinic. All tests occur during an eye examination.

During a visual acuity test, the patient reads letters on a chart, explains Mayo Clinic. Another test measures the curvature of the cornea with a keratometer. This device can confirm the presence of astigmatism by looking at how the cornea curves. Doctors may further examine the curve of the cornea through corneal mapping, which involves using a keratoscope with a video camera to create a map of the surface of the cornea.

A doctor may also test to measure the patient's light focus, as noted by Mayo Clinic. To measure the eye focus light, the doctor may place several lenses in front of the patient's eyes with a phoropter. A doctor may also use a retinoscope, which directs light into the eye to determine how the eye focuses the light.

Treatment options for astigmatism include corrective contact lenses or eyeglasses, as reported by Mayo Clinic. Additionally, there are three corrective surgeries patients with astigmatism may consider: laser-assisted in-situ keratomileusis, photorefractive keratectomy and laser-assisted subepithelial keratomileusis.