Session 3 of 12
How is vision-impairment defined?
Course: TSA-TGSI-1.3 | Length: 2:57 mins | Instructor: Dean Homicki
Transcript
In this session, we're going to learn about:
How is vision-impairment defined?
Vision impairment is defined as…
a limitation of one or more functions of the eye or (visual system).
How is vision-impairment measured?
Vision impairment is measured in two ways:
Visual Acuity: Visual Acuity is the measure of the eye's ability to resolve detail from both short & long distances and a field of view.
Visual Field: Visual Field is the measure of a person's peripheral vision. That is, what can be seen all around while looking straight ahead.
How Is Visual Acuity Measured?
Visual acuity is measured in fractions. 6/6 is considered to be 'Normal Vision.' while 6/60 or less is considered to be a person experiencing some form of ‘Vision Impairment’.
A person with the visual acuity of 6/60, sees at 6 metres, what the person with a visual acuity of 6/6… can see at 60 metres. In Australia, a person experiencing Visual Acuity of 6/60 or less, describes them as vision-impaired and legally blind.
How is Visual Field measured?
Visual Field is measured in degrees. A person who has their full vision will experience … "a field of vision of an average 180 degrees."
A person who has a vision impairment is likely to experience… "a field of vision of an average 18 degrees." In Australia, a person experiencing a Visual Field of 18 degrees or less describes them as vision-impaired and legally blind.
In the next course Module, we review: What are the types of Vision-Impairments?
This is an excellent set of modules the will help broaden our understanding of what it is like to live with a vision-impairment.
I'm Dean Homicki. And I look forward to seeing you in the next Session.
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Sources
TSA-TGSI-1.3 - This staebl.academy course module has drawn information from the following sources:
(RIDBC) Royal Institute of Deaf and Blind Children - http://www.ridbc.org.au/blindness
Visability: http://www.visability.com.au/community-education/vision-impairment/
