Astigmatism - Test

What test did you have to diagnose your astigmatism?

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How is astigmatisms diagnosed?

Astigmatism is diagnosed during the measurement for glasses (refraction). The eye's overall astigmatism can be measured objectively by a manual technique using a device called a retinoscope, or automatically with an autorefractor machine. Subjectively, a patient can determine the necessary astigmatism correction by choosing from several different powers of lenses. The various lens powers are presented to the patient while viewing a chart through a phoropter.

Distinguishing which portion of the astigmatism is arising from the cornea versus arising from the lens can be important, particularly when fitting a contact lens or planning a surgical procedure. This can be done by examining the shape of the cornea with studies such as topography and keratometry. Wavefront analysis is another tool that is useful in evaluating irregularities in the way the eye focuses light.

If the astigmatism is found to be irregular, further studies may be necessary. A thorough eye examination including a slit lamp examination can be used to detect external forces that are warping the cornea (such as drooping eyelid, suture, scar, and others). If the cornea's shape is irregular due to a suspected corneal disease (such as keratoconus, pellucid marginal degeneration, post-LASIK ectasia, and more) further studies may be necessary to confirm the suspected diagnosis.

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