Snellen Eye Chart Model 20 Foot

Eye Chart Features: Non-reflective, matte finish with green and red color bars. 20' distance. The Snellen eye chart is the familiar chart with the big letter or symbol at the top and progressively smaller letters at the bottom of the chart down to 20/20 or better. This is a chart for measuring visual acuity at a distance - in other words, how well you can see things that are far away. Graham-Field has been supplying the healthcare market with one of the broadest selections of high quality healthcare products and services. All of their products have been designed with a single objective - to enhance the quality of life of the people that use their products and their caregivers.their brands, such as Everest & Jennings and LaBac, Lumex, Labtron, Grafco, Smith & Davis and Simmons-offer the quality and value you've come to trust. The product referenced on this detail page is sold be Each.

Snellen Eye Chart The Snellen Eye Chart is used to test visual acuity, position the patient 10 or 20 feet in front of the Snellen eye chart (depending on model chosen). Allegro Medical presents the Snellen Eye Chart: This test measures how well you see at various distances. The eye chart itself -- the usual one is called 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 the Snellen Eye 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 20 20 Snellen Eye 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 h