Sometimes if the optic nerve does not form properly, it will not send information to the brain, which can lead to blindness.
Blindness can also be genetic or carried through the genes.
Accidents can also be to blame.
Illnesses/diseases: diabetes, cataracts etc…but this usually occurs in older people.
retinoblastoma-rare cancer that occurs in children
Normally sighted: visual field of 180 degrees. Legally Blind: visual field of less than 20 degrees.
Legal blindness = vision of 20/200 or less. This means that this person sees at 20 feet that a normally sighted person can see at 200 feet. Most people can fix this with glasses. Total "visual field". This means that a person cannot see the whole object as a normally sighted person can.
Visual Field This picture shows the normal visual field with the line through the middle. The small circle closest to the fish demonstrates the visual field for a legally blind person. The normal visual field would be able to see more of the fish.
In the San Diego Unified School District Visually Impaired students are taught by being introduced to a
Braille letter recognition program.
Following mastery of the letters, students begin with the Braille reading program that starts at level 10 through level 38. Teachers then accommodate for their students by giving them worksheets and homework in Braille. The parents of the these students are given text copies of all of
the work given so that they can help their children.
Understand the background of the student How much vision does the student have? How did they become blind? How long has the student been blind?
Technology is a good tool. There is downloadable computer software that transcribes information into Braille dots. There is also software such as text to speech and voice recognition to facilitate use of computers by blind students.
Any visually impaired child who is living in the United States or Canada and is between the ages of 3 and 18 is eligible for the Braille Special Collection Program through the Braille Institute that gives blind students braille books.
Online Resources for Teaching Blind Students http://www.uni.edu/walsh/blindresources.html
Access It-The National Center on Accessible Information Technology in Education