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Vision |
Description |
Blindness and low vision: a condition of partial or total impairment of sight or vision that even with correction affects educational performance adversely. (Ontario Ministry of Education)
Blindness is usually defined as having a distance acuity of 20/200 or less in the better eye with the best possible correction or a restriction in visual fields (less than 20 degrees). The measurment of 20/200 indicates that a student who is legally blind will see at 20 feet what a student with normal vision can see at a distance of 200 feet.
Low vision or partial sight is usually defined as having a distance visual acuity of 20/70 or less in the better eye with the best possible correction.
Additionally, visual impairments are classifed as either congential, which refers to vision loss that was present at birth, or adventitious, which refers to vision loss that occurred after birth and that is a result of an illness or accident. |
Additional Resources |
(1) Ontario Curriculum Unit Planner Special Education Teacher Companion at: http://www.ocup.org/resources/documents/companions/speced2002.pdf (2) The Canadian National Institute for the Blind at: http://www.cnib.ca (3) The American Foundation for the Blind at: http://www.afb.org |
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