Eye chart, Snellen's: The familiar eye chart used to measure how well you see at various distances.
Snellen's chart is imprinted with block letters that line-by-line decrease in size, corresponding to the distance at which that line of letters is normally visible.
The letters on Snellen's chart are, not surprisingly, called Snellen's test type. Each block letter is quite scientific in design (so that at the appropriate distance the letter subtends a visual angle of 5 degrees and each component part subtends an angle of 1 minute).
The chart and the letters are named for a 19th-century Dutch ophthalmologist Hermann Snellen (1834-1908) who came up with them as a test of visual acuity. Visual acuity refers to the clarity or clearness of the vision, a measure of how well a person sees. The word "acuity" comes from the Latin "acuitas" = sharpness.
By Disabled World - 2007-10-30. Printable Snellen eye chart you can download and print for home use to determine your visual acuity ie. 20/20 vision.
Classic Eye Chart: Joel Schneider's 3-page Snellen Chart plus near vision testing card. in PDF; PostScript source code. Modern Standard: ETDRS charts based on those provided on ...
Snellen Chart. This is the same chart that your doctor uses to ... Back to Eye Tests List To MD Support Home Page
The Snellen chart, more commonly called an eye chart, is a common tool used by eye care professionals, driver's license exam supervisors, or anyone else interested in ...
A Snellen Eye Chart is an eye chart used by eye care professionals and others to measure how well you see at various distances.