The goal of laser vision correction surgery like LASIK (laser in-situ keratomileusis) is to reduce or eliminate dependence on corrective lenses. LASIK can be used to correct low to high levels of the following eye problems:
This occurs when the cornea is too curved or the eye is too long, which causes light to focus in front of the retina, resulting in blurry distance vision. LASIK helps flatten the shape of the cornea so that light rays entering the eye fall on the retina, instead of in front of it, bringing clearer vision.
This occurs when the cornea is too flat and the eye is too short for light rays to fall where they should. This causes light to focus at a point beyond the retina, resulting in blurry close vision, and sometimes blurry distance vision, too. LASIK steepens the corneal curvature, allowing the light rays to fall on the retina, rather than beyond it. This adjustment allows you to see clearly.
This occurs when the cornea is shaped like a football, more curved in one direction than the other, and often occurs with nearsightedness or farsightedness. Astigmatism causes light to focus on more than one point, resulting in blurry and distorted vision. LASIK rounds the corneal curvature, bringing light rays together with the retina as the only focal point. This allows you to see crisper images.
This is a condition of middle age, when people who have never needed glasses to read now need to wear bifocals or reading glasses. Presbyopia results when the focusing system of the eye loses its flexibility with age. One way to address this without glasses is to create a monovision effect with multifocal LASIK surgery. With monovision, one eye sees slightly better at distance, and the other sees better up close. Well-established LASIK technology has advanced for the purpose of producing freedom from ALL glasses and contacts, especially for people 48 years and older. Learn about other treatment options for presbyopia.