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 International Resources for the Improvement of Sight International Resources for the Improvement of Sight (IRIS) is an International NGO that specializes in prevention of blindness and restoration of sight. It was founded in 1996 by Michele Claudel and John Stewart. It was initially founded to help people in Cambodia without access to eye care, it has since expanded to Nepal, Lao PDR and Sri Lanka. IRIS equips new eye clinics, strengthens existing ones, conducts eye screening, provides cataract surgery for poor people, primary eye care training for staff. IRIS has partnered with other NGOs to provide funding for services, such