Refractive errors are optical imperfections that prevent the eye from properly focusing light, causing blurred vision. The primary refractive errors are nearsightedness, farsightedness and astigmatism.
Refractive errors usually can be "corrected" with eyeglasses or contact lenses, or they can be permanently treated with LASIK / FENTOLASIK / SMILE and other vision correction surgery (also called refractive surgery).
Causes Of Refractive Errors -
The eye's ability to refract or focus light sharply on the retina primarily is based on three eye anatomy features: 1) the overall length of the eye, 2) the curvature of the cornea and 3) the curvature of the lens inside the eye.
It can be detected by performing a test called a refraction. Your eye doctor will use the results of your refraction to determine your eyeglasses prescription. Eyeglass lenses and contact lenses are fabricated with precise curves to refract light to the degree necessary to compensate for refractive errors and bring light to a sharp focus on the retina.