How old should my child be to be tested for color blindness?

How old should my child be to be tested for color blindness?

A child can be successfully tested for color vision deficiency around age 4. At that age, he or she is developed enough to answer questions about what he or she sees. Many schools will perform color vision tests at an early age to determine if color-coded learning devices will be an issue. If so, alternative learning materials can be chosen.

Keep in mind though that children should be screened for other related vision issues such as nystagmus and low vision at a younger age.