|
Medical Definition of Snellen's test types
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. (05 Mar 2000)
|
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. (05 Mar 2000)