This Snellen chart includes Red and Green color bars for an easy and helpful place start the test.
Screens for Amblyopia.
Snellen optotypes date back to 1862, when Herman Snellen released his first eye test in England. These Snellen optotypes have changed little throughout the years and are used regularly today. These optotypes feature strong serifs and follow idea of the 5×5 grid. This idea is being used by many other optotypes today, including Sloan and Patti Pics optotypes. Snellen chart is also coupled with red and green stripes for an ease of testing.