2020–2021 BCSC Basic and Clinical Science Course™
11 Lens and Cataract
Chapter 6: Evaluation and Management of Cataracts
Measurements of Visual Function
Visual Acuity Testing
It is useful to measure Snellen acuity under lighted and darkened examination conditions. Although visual acuity testing in the ophthalmologist’s office is commonly performed in a darkened room, diminished Snellen acuity from a symptomatic cataract is sometimes demonstrated only in a lighted room. Distance and near visual acuity must be tested and careful refraction performed so that BCVA can be determined. Visual acuity may improve after pupillary dilation, especially in patients with a PSC.
Excerpted from BCSC 2020-2021 series: Section 11 - Lens and Cataract. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.