VSP 3/15/11

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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!
- HRR:
- 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 Extremely outdated test ?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.

Author

yumih503

81545

Card Set

VSP 3/15/11

Description

VSP 3/15/11

Updated

2011-04-25T02:18:33Z