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19 Cards in this Set
- Front
- Back
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With Macular degeneration what part of their vision to they lose?
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will lose central vision but will always have their peripheral vision.
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Steps of Dispensing Low Vision Aids
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1. Make sure patient is under current care of eye doctor/wearing best corrective
2.Determine patient's visual goals 3.Determine Magnification necessary for visual goals 4. Illumination 5. Select appropriate vision AT |
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What percentage of the low vision community has macular degeneration?
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70%
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What is the most accurate way to determine needed magnification ?
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Divide BVAg/ BVAa
EX. BVAg=20/50 BVAa= 20/200 200/50= 4X |
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What does BVAa stand for?
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Best visual acuity (actual)
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What does BVAg stand for
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Best visual acuity (goal)
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What size print is 20/50
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Newspaper size
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How many Diopeters is 1 X
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1X = 4D
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Fluorescent Lighting
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high blue wavelength for MD clients
Increases ocular glare filter light to improve contrast; MD problem increase intra ocular glare Contributes to glare |
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four types of light
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Flourescent
Incandescent Halogen Light emitting diode |
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Which light type is considered a common light bulb and has dimmest light source?
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Incandescent
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What is the brightest light source with best?
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Halogen
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Which light source has high battery consumption
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Halogen
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What does LED stand for
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Light Emitting Diode
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What offers an extended light source and tends to have a blue cast to it. Is comfortable for most people
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LED
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3 things to look for when choosing a source of illumination
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Type
Distance Direction |
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Where should the light source be placed for someone with low vision?
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over the dominant eye shoulder. Creates reflectionm glare back to the eye
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How many vision aids does the average person with low vision need?
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three
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Info about the Hand Held Biomagnifier
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Bi Convex- curved on both sides
Inexpensive Distorts text Good for menus, maps etcs |
