low vision assessment tools & methods: putting together your low vision kit maer conference...
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Low Vision Assessment Tools & Methods:
Putting Together Your Low Vision Kit
MAER ConferenceMichigan Chapter
Dorothy Goldie Addison March 22, 2013
Phase OneArea Item Source CostDISTANCE VISION Original Distance Test
Chart f/t Partially SightedDesigns for Vision
Occluders Bernell/ Vision Assoc 6.95 - 9.50
Handheld close-focus telescopes 4X & 6X
Bernell/LS&S 43.95 - 110.00
NEAR VISION Lighthouse Near Acuity Chart (Sloan letters)
Good-Lite 25.00
Trial lenses Gulden Ophthalmics 10.00/ea (120.00)
Lens holder- 4 wells Bernell 19.50
Magnifier- 4X dome- 76mm
LS&S 45.00
EYE USAGE Worth 4-Dot Bernell 16.25
Stereo Fly Bernell/Vision Assoc 165.00 – 179.95
r/g reading units Bernell 8.95
VISUAL TRACKING K-D Test for Reading King-Devick 45.00
Bright Line Reading Guide APH 7.50
COLOR VISION Farnsworth D15 Bernell/ Vision Assoc 150.00 – 184.95
Phase TwoArea Item Source Cost
DISTANCE VISION LEA Symbol Book Bernell/ Vision Assoc 45.95
Additional handheld close-focus telescopes 3X & 8X
Bernell/ LS&S 40.00-110.00
NEAR VISION LEA Playing Cards Vision Assoc 27.00
Additional magnifiers--Eschenbach lighted Makrolux-Eschenbach Easy Pocket
Eschenbach235.00
125.00
Reading stand-Grand Stand
APH 47.00
EYE USAGE 3-Figure Test Bernell/ Vision Assoc 36.50-48.00
Red/green flipper Bernell 8.25
VISUAL TRACKING DEM Developmental Eye Movement Test
Bernell 88.50
VISUAL PERCEPTION MVPT Motor Free Visual Perception Test
Bernell 128.95
COLOR VISION Color Vision Tests-Ishihara/Wagoner/Improved Good-Lite
Bernell/ Vision Assoc 99.95-149.95
Phase ThreeArea Item Source Cost
DISTANCE VISION Grating Paddles or Bernell/Assoc 186.95 – 211.95
(Teller Cards) Bernell (1995.00)
NEAR VISION LEA Pocket-sized Near Vision Card
Vision Assoc 11.50
VISUAL PERCEPTION TVPS Test of Visual Perceptual Skills
Bernell 149.95
CONTRAST SENSITIVITY LEA Low Contrast Flip Charts
Vision Assoc 90.00
Sources
• APH-- http://shop.aph.org• Bernell-- www.bernell.com• Designs for Vision-- www.designsforvision.com• Good Lite-- www.good-lite.com• Gulden Ophthalmics
www.guldenophthalmics.com• King-Devick-- http://kingdevicktest.com• LS&S-- LSSproducts.com• Vision Associates-- www.visionkits.com
Distance Visual Acuity
Grating acuity
Distance acuity
Optotype acuity
Vision Simulators
Visual Acuity Simulators
• Use plus lenses to create level of blur:
20/70 +1.5020/100 +2.0020/200 +3.00 - +2.5020/400 +4.00 - +4.5020/600 +5.00 - +6.0020/800 +6.00
Visual Field Simulators
Near Visual Acuity
2 each:+1.00+2.00+3.00+4.00+6.00+8.00
Trial Adds
• If grade level material is in a smaller font than the functional print size, trial adds are indicated.
• Consider the range of add generally prescribed for the student’s distance acuity level.
• Provide practice/demonstration for the student in how to use the trial lenses, slowly finding the clearest image while adjusting the distance from the text.
Visual acuity Seating Power of TS Power of near add
20/70 range 5-6 feet 2-3X +2.00D
20/100 range 4 feet 3-4X +2.00 -+3.00D
20/200 range 3-4 feet 4X +4.00 - +5.00D
20/300 range 2 feet 6X-8X +6.00 - +8.00D (2X MS)
20/400 range 1 foot 3X MS
Eye Usage/ Depth Perception
Visual Tracking
Fixation Targets
Advantages of K-D Test
• Simple to administer, requires little time to administer
• Uses digits (usually well-learned) vs alphabet or words
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• Compare time it takes for student to complete each subtest as compared to same age peers.
• Note nature of errors, if any.• If slower than peers or errors occur, vary format
of test or introduce strategies to determine whether any are helpful.– Large Print subtests– Use of a line marker (Bright Line Reading Guide)– Use of finger-pointing strategy– Elevation or re-positioning reading material
Bright Line Reading Guide
Visual Tracking or Automaticity?
DEM Vertical Subtests
Visual Field
Color Vision
Visual Perception
Other Items
• Retractable measuring tape• Paper samples• Wind-up toys• Lighted toys• Toys with light and sound- cause & effect