Vision - Blindness



The Eye Color Blindness > Blindness < Diseases Canes Other Aids Computers Reading Braille Moontype Interviews Guide Dog Deaf and Blind Fun	Blindness Blindness can be defined physiologically as the condition of lacking visual perception. The definition as it applies to people thus legally classified is more complex. In North America and most of Europe, legal blindness is defined as visual acuity (vision) of 20/200 (6/60) or less in the better eye with best correction possible. This means that a legally blind individual would have to stand 20 feet from an object to see it with the same degree of clarity as a normally sighted person could from 200 feet. In many areas, people with average acuity who nonetheless have a visual field of less than 20 degrees (the norm being 180 degrees) are also classified as being legally blind. Approximately ten percent of those deemed legally blind, by any measure, are fully sightless. The rest have some vision, from light perception alone to relatively good acuity. Adaptive techniques Visually impaired and blind people have devised a number of techniques that allow them to complete daily activities using their remaining senses. These might include the following: Adaptations of banknotes so that the value can be determined by touch. For example: In some currencies, such as the euro and pound sterling , the physical size of a note increases with value. A lot of banknotes from around the world have a tactile feature to indicate denomination in the upper right corner. This tactile feature is a series of raised dots, but it is not standard Braille. It is also possible to fold notes in different ways to assist recognition. Labeling and tagging clothing and other personal items Placing different types of food at different positions on a dinner plate Marking oven, dishwasher, and dryer dials for ease of use
"The only thing worse than being blind is having sight but no vision"

Blindness

Adaptive techniques