Notation of visual acuity Notation of visual acuity. “VA” is the standard notation for visual acuity (1). The visual acuity of the right eye is written on top (2) (often designated OD or RE), and the left eye on the bottom (OS or LE). A “+” or “−” is added to the Snellen acuity (3) to note that the subject read a few letters on the following line (+), or to show the number of letters that could not be read on the designated acuity line (-). A “d” (or no designation) means that the standard 20-foot test distance was observed (4). An “n” shows that a near card (with Snellen-equivalent notation) was used to test the visual acuity (such as at the bedside). Patients who wear glasses should wear them when visual acuity is being tested (designated as “cc” for “with correction”) (5). If no glasses are worn, the designation “sc” is used. Source: Testing Sensory Visual Function, Practical Neuroophthalmology Citation: Martin TJ, Corbett JJ. Practical Neuroophthalmology; 2013 Available at: https://neurology.mhmedical.com/DownloadImage.aspx?image=/data/Books/1041/martin_ch2_fig5.jpeg&sec=59022239&BookID=1041&ChapterSecID=59021897&imagename= Accessed: November 09, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved