low vision assessment tools & methods: putting together your low vision kit maer conference...

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