Type: Term Pronunciation: snel′ĕn Definitions: 1. square black symbols employed in testing the acuity of distant vision; the letters vary in size in such a way that each one subtends a visual angle of 5′ at a particular distance. Found on http://www.medilexicon.com/medicaldictionary.php?t=90962
Type: Term Pronunciation: snel′ĕn Definitions: 1. square black symbols employed in testing the acuity of distant vision; the letters vary in size in such a way that each one subtends a visual angle of 5′ at a particular distance.