Contact Lens Overrefraction

Sometimes we wish to determine the etiology of poor vision of an eye with an irregularly shaped cornea and other possible causes of decreased acuity, such as macular degeneration. Finding out whether refraction over a rigid contact lens achieves good acuity is then diagnostically useful, even when actual contact lens wear is not being considered.

Excerpted from BCSC 2020-2021 series : Section 3 - Clinical Optics. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.