Eye chart number). The denominator indicates the distance in feet at which a person with normal vision could stand to correctly identify the same symbols identified by the person tested. For example, a visual acuity of 20/20 is considered normal. Numerous types of eye charts exist and are used in various situations. For example, the Snellen chart is designed for use at 6 meters or 20 feet, and is thus appropriate for testing distance vision. There is often also a need to test a subject's vision at near or occupational tasks (such as reading or computer use). For these situations, a Rosenbaum
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