Eye chart chart or Jaeger chart can be used. While the Snellen chart remains the default, some authors have argued that the logMAR chart is superior. The logMAR chart presents the same number of symbols on each line, uses a typeface with letters that are equally legible at various sizes, and by varying the symbol size logarithmically, it is easier to use at nonstandard distances. As a consequence of these improvements, the logMAR chart has been proposed as a more reliable tool for measuring visual acuity. However, the logMAR chart has not yet been widely adopted. It can be difficult to measure
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