Butz, Henry - PhotographerRamblings, musing, and observations of New York Photographer, Henry ButzHelp me please - I hate all Opticians!- October 14, 2004 In 1862, a man named Snellen devised a testing system to determine people's eyesight. He asked people to stand at 20 feet and through experimentation discovered the smallest sized letter that most people with good eyesight could see. He called this a size 20 letter and the vision was recorded as 2020...http://www.hbutz.com/wwwboard/messages/201.html |