Snellen chart H, K, O, S, 3, U, Y, A, C, E, G, L, 2. The normal Snellen chart is printed with eleven lines of block letters. The first line consists of one very large letter, which may be one of several letters, for example E, H, or N. Subsequent rows have increasing numbers of letters that decrease in size. A person taking the test covers one eye from 6 metres or 20 feet away, and reads aloud the letters of each row, beginning at the top. The smallest row that can be read accurately indicates the visual acuity in that specific
International Resources for the Improvement of Sight as with The Vision Charity in Sri Lanka. IRIS has also partnered with the Cambodian government program National Program for Eye Health in establishing eye clinics. Another partner is the International Centre for Eyecare Education. As of December 2008, the combined total of IRIS clinic and eye camp programs since its inception in Cambodia had resulted in 125,319 people receiving eye examinations and 23,485 surgeries being performed free of charge, 15,291 of which were to remove cataracts. In 2011, Roger Freeland Biggs was the CEO of IRIS and he was awarded an OBE "for services to Health in Asia". International