Snellen test type | definition of Snellen test type by Medical dictionary
Snellen test type
Snel·len test type (snel'ĕn test tīp)
One of a series of 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.
References in periodicals archive
At the time of presentation, best corrected visual acuity recorded was 6/6 in RE and FC at 3 m in LE (Snellen test types