People are usually visually disabled, if they are unable to
perform certain tasks because of their visual impairment. Visual
impairment may impact on daily living activities. A range of
functions may be affected by visual impairment, including visual
acuity and visual field, but in addition, visual functions such
as contrast sensitivity, colour vision, visual adaptation to
different luminance levels, diplopia may be affected. Visual
impairments are divided into two general categories: blindness
and low vision. Individuals with blindness have absolutely no
sight, or have so little that “vision“ must take place through
other senses. Only 10-15% of the visually impaired population is
totally blind. People with low vision have severe impairments
whether due to genetics, traumatic injuries, or illnesses and
need special accommodations, but are still able to see. The term
“Legally blind” is used to describe a person who has visual
acuity of less than 3/60. This means that a legally blind
individual would have to st