The American Optometric Association recommends that candidates for laser or surgical methods of corneal modification be at least 21 years of age or older with stable vision and no abnormalities of the cornea or external eye. Ortho-K, a non-surgical corneal modification procedure, may be appropriate for preventing or reducing further vision change in younger people who do not have fully stabilized vision. If you are interested in a corneal modification procedure, your doctor of optometry will provide a comprehensive eye examination to assess the health of your eyes and your visual abilities before discussing the benefits and risks of procedures that are appropriate for you.