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Color Vision Tests
- Matching tests
- Arrangement tests
- Pseudoisochromatic plates
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.
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
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!
- o Acquired and congenital ? so good we made you get it. Also tests for tritan defects!
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 Extremely outdated test ?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.