When one or more parts of the eye or brain that are needed to process images become diseased or damaged, severe or total loss of vision can occur....
http://www.kidshealth.org/teen/diseases_conditions/sight/visual_i... (google 1)I) 2) 
...
http://www.yahoo.com (yahoo 1)
I) 3) RNIB home page
Helping people with serious sight problems in the UK. Information about their services, publications, products and information about their rights. www.rnib.org.uk/ ...
http://www.rnib.org.uk/ (ask 1)
I) 4) Visual impairment - Wikipedia, the free encyclopedia
Visual impairment or vision impairment is vision loss that constitutes a significant limitation of visual capability resulting from disease, trauma,...
http://en.wikipedia.org/wiki/Visual_impairment (google 2)I) 5) let us know
. Return to ...
http://arc.help.yahoo.com/arc/?.intl=us&srv=search.yahoo.com (yahoo 2)
I) 6) Blindness / Visual Impairments / Family Village Library
National Association for Parents of Children with Visual Impairments ... www.familyvillage.wisc.edu/lib_blnd.htm ...
http://www.familyvillage.wisc.edu/lib_blnd.htm (ask 2)
I) 7) Disability Info: Visual Impairments Fact Sheet (FS13)
The terms partially sighted, low vision, legally blind, and totally blind are used in the educational context to describe students with visual impairments....
http://www.nichcy.org/pubs/factshe/fs13txt.htm (google 3)I) 8) Vision problems - Information from NIH
Alternate Name(s): Vision Impairment; Impaired vision; Blurred vision ... There are many types of eye problems and visual disturbances. These include blurred vision, halos, blind spots, floaters, and o...
http://www.nlm.nih.gov/medlineplus/ency/article/003029.htm#Defini... (ask 3)
I) 9) Strategies for teaching students with vision impairments
The major challenge facing visually impaired students in the scienceOffer to read written information for a person with a visual impairment,...
http://www.as.wvu.edu/~scidis/vision.html (google 4)I) 10) NFB - Home
Resources for the blind: Services, technology news, visual aids and research information. www.nfb.org/ ...
http://www.nfb.org/ (ask 4)
I) 11) visual impairment