Norm of Color Vision Tests
The client is able to identify all the colors, symbols, and patterns presented.
Usage of Color Vision Tests
Screening for retinal disease or color vision deficiency (such as red-green or blue-yellow deficiency).
Description of Color Vision Tests
A test using pseudoisochromatic plates with numbers or letters buried in a matrix of colored dots. Deficits can be genetic and result from one or more of the three-color cone systems, or deficits can be acquired.
Professional Considerations of Color Vision Tests
Consent form NOT required.
- Obtain an eye patch or hand-held occluder, test kit, and pointer.
- One eye is occluded, and the test booklet is held approximately 14 inches (35 cm) in front of the unoccluded eye.
- Sample plates of different patterns of primary colors with a background of a variety of colors are shown to the client, one at a time.
- The client is asked to identify the patterns of the primary colors and to trace the patterns with a pointer.
Client and Family Teaching
- Bring corrective glasses or lenses to the test.
- There are no food or fluid restrictions.
- The test is painless.
Factors That Affect Results
- Conduct the test in a well-lighted area.
- Abnormalities of the ocular media, the retina, or the optic nerve can affect results and should be ruled out if color blindness is discovered.
- The client may be unable to cooperate and participate in the test.
- Color blindness may include more than one kind of spectral color.
- Color vision is not affected by laser in situ keratomileusis (LASIX) surgery.