Eye chart smaller towards the bottom of the chart. The person removes any glasses or contact lenses, and stands or sits a standardized distance from the chart (e.g., 20 feet for the Snellen chart). The person is then asked to identify the optotypes on the chart, starting with large rows and continuing to smaller rows until the optotypes cannot be reliably identified any more. The row in which the person can reliably identify symbols defines the visual acuity. One eye is tested at a time. Practically, this is accomplished by covering the other eye with a hand, piece of paper, or a
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