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The cornea and the lens are responsible for refracting (bending) light to help focus it on the retina. Unfortunately, few eyes are able to perfectly focus the image onto the retina without the assistance of either glasses or contact lenses.
Patients who are myopic, (or nearsighted), are able to see well up close without glasses but require glasses for distance. These eyes have corneas that refract the light too much.
Patients who are hyperopic, (or farsighted), are able to see somewhat clearly at distance but not well up close. Some farsighted people can’t see up close or at a distance. These eyes have corneas that don’t refract light enough.
Finally, patients with astigmatism have an irregularly shaped cornea or an irregularly shaped natural lens which prevents the image on the retina from being in focus.
One condition LASIK will not cure is presbyopia. Presbyopia is the normal aging of eyes which requires people to need reading glasses usually starting in their mid-forties. If you are suffering from presbyopia, inquire about monovision with LASIK.
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