Common Refractive Errors


Lt Col Reynolds
Many millions of people wear eyeglasses or contact lenses to correct refractive errors, such as nearsightedness, farsightedness, or astigmatism. Refractive errors affect the cornea and are the most common of all vision problems in the United States.

Refractive errors occur when the lens and cornea do not focus the light perfectly on the retina.

Absence of refractive error, called emmetropia, occurs when the lens and cornea focus light on the retina with precision.

In this section, you can find out about the following common refractive errors:

  • Myopia, or nearsightedness
  • Hyperopia, or farsightedness
  • Astigmatism, and
  • Presbyopia