Refractive errors occur when there is a variance between the focusing strength of the eye and the length of the eyeball. When a refractive error is present, light entering the eye is not focused, which results in a blurry image. Refractive errors are the most common vision disorder and can be corrected by eyeglasses, contact lenses or refractive surgery. The four most common refractive errors are myopia (nearsightedness), hyperopia (farsightedness), astigmatism, and presbyopia.































Refractive Error