VSP 3/15/11

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VSP 3/15/11
2011-04-24 22:18:33

VSP 3/15/11
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  1. Color Vision Tests
    • Matching tests
    • Arrangement tests
    • Pseudoisochromatic plates
  2. Matching tests (Anomaloscopes)
    • - Based on work by Rayleigh (red + green = yellow)
    • - Most accurate; expensive; difficult to use
    • - Patient mixes colors to obtain the color of regard.
    • - Traditionally for red-green defects only. Red-green defects are more common! So this is clinically more relevant.
    • - Sloan Achromatopsia Test. This is another type of matching test.
  3. Arrangement tests (testing distance: 50cm)
    • - Farnsworth Munsell 100 Hue Test (FM 100)
    • o Uses the chromaticity diagram (CIE) / takes a long time.
    • o One tray is tested at a time.
    • - Farnsworth Dichotomous Test for Color Blindness (Panel D-15).
    • o Good screener for congenital and acquired defects. Takes less time than the 100 Hue.
    • - L’Anthony desaturated D-15
    • o Detects mild defects.
    • - Adams desaturated D-15
  4. Pseudoisochromatic plates (color confusion)
    • “PIC Test” (testing distance: 75cm)
    • Different strategies on various plates
    • o Example: vanishing vs. transformational designs.- Ishihara:
    • o Good screener for congenital defects. Only red-green!
    • HRR:
    • o Acquired and congenital ? so good we made you get it. Also tests for tritan defects!
  5. Occupational Color Tests (Functional Tests)
    • Can be for specific needs or occupations (over 100 careers require color vision testing).
    • o Can be as simple as color naming. ? Not very sensitive.
    • Holmgren Wool test (1874)
    • o Clinically unreliable. They dyed strands of wool and asked people to match them. Extremely outdated test ? not used anymore.
    • Farnsworth Lantern Testo Railroads. You flash the light at them and change the color of the light and have them identify what color the light is.