VI_1 - Understanding Visual Impairments Chapter 14 Anatomy...

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Understanding Visual Impairments Chapter 14
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Anatomy of the Eye http://www.stlukeseye.com/Anatomy.asp
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See Table of Vision http://www.discoveryfund.org/anatomyoftheeye.html
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Defining Visual Impairments: Legal Definition Legal Blindness: Based on acuity 20/200 from 20 feet away can see print size 200 (the big E) Using both eyes wearing glasses Based on field of vision Field of vision is <20 degrees normal is 160 degrees Purpose of legal definition: Determines eligibility for governmental allowances: Income tax reduction Specialized job training Support services
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KEY CONCEPT Most persons with legal blindness do have some usable vision.
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Defining Visual Impairments: IDEA Definition Impaired vision, even with correction, that adversely affects educational performance Includes: Blindness Partial sight In other words, a student must have a visual disorder that interferes with learning.
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Educational Classifications for VI Students Low Vision Read print Rely primarily on vision for learning May or may not be legally blind Functionally Blind Use Braille for reading and writing Use vision to supplement auditory and tactile learning Totally Blind Use Braille Do not receive meaningful input from vision Learn through tactile and auditory input
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Low Vision Samples http://www.lighthouse.org/about/low_vision
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VI_1 - Understanding Visual Impairments Chapter 14 Anatomy...

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