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What Causes Refractive Errors?

Light rays enter the eye through the cornea, pupil, and lens, and images are relayed to the brain from the retina. As you can learn by watching this video, unclear vision is usually caused by one of four kinds of refractive error.

Myopia, or nearsightedness, occurs when the distance between the cornea and the retina is too long and light rays focus in front of the retina instead of on it. Hyperopia, or farsightedness, is a refractive error that occurs when the distance between the cornea and the retina is too short, causing light rays to focus behind the retina. Astigmatism occurs when the cornea is curved and light cannot properly focus on the retina, while presbyopia is caused when the lens ages.

If you live in NYC and are considering LASIK or other treatment options to correct refractive errors, call Dr. Mark Hornfeld of Vista Laser Vision today at (212) 580-8881. Visit our website to learn more about our treatments.