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A 36-year-old member asked:

how do people figure out that they're color blind?

2 doctor answers6 doctors weighed in
Dr. Mary Efremov
Internal Medicine 43 years experience
Ichehara test: There is a set of color images that help determine that.
Dr. Richard Bensinger
Ophthalmology 52 years experience
Comparison with peer: They usually discover this when they are in a situation in which color choice is necessary and they notice their peers making choices difficult or impossible for them. This usually occurs in school such as when picking crayons to color a picture or using colored papers and picking the wrong color for a certain task. Then they can be formally tested to determine the actual type.

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Similar questions

A 40-year-old member asked:

Can you fly a plane if you are color blind?

2 doctor answers2 doctors weighed in
Dr. Robert Kwok
Pediatrics 33 years experience
Yes: A pilot in the U.S. Is allowed to fly planes even if he is color blind, but he has 2 restrictions on his license. His license will say "not valid for night flying or by color signal control". Color signal control is when the control tower flashes red, green, or white lights at the pilot to give him instructions when the radios are not working, which rarely happens.
CA
A 25-year-old member asked:

How come some people are color blind and some people are not?

3 doctor answers7 doctors weighed in
Dr. Daniel Goldberg
Specializes in Ophthalmology
Color Blindness: Color blindness is a manifestation of a wide array of diagnoses. It may be inherited as in x-linked color blindness (affecting males only) or acquired as in optic neuropathy. A long list of abnormal genetic diseases may cause color blindness including achromatopsia and others. Some forms of color blindness are relative and some are absolute where the patient only sees shades of gray.
A 24-year-old member asked:

What makes a person color blind?

3 doctor answers6 doctors weighed in
Dr. Robert Kwok
Pediatrics 33 years experience
A genetic mutation: A person is born color blind because he has a mutation in the genes that are needed to see certain colors the way a normal person sees colors. Most color blind people can see many colors, but the colors appear in a "different" hue, compared with how the colors appear to a normal person. Very rarely does anyone have total color blindness and see only black, white, and gray.
A 47-year-old member asked:

Can you regain the ability to see color if you are color blind?

3 doctor answers6 doctors weighed in
Dr. Robert Kwok
Pediatrics 33 years experience
No: Several varieties of color blindness exist, but they are permanent conditions. A person is born color blind because he has a mutation in the genes that are needed to see certain colors the way a normal person sees them. Most color blind people see many colors, but the colors appear in a "different" hue. Very rarely does anyone have total color blindness and see only black, white, and gray.
A 43-year-old member asked:

What are the ways that color blind people figure out that they're color blind?

2 doctor answers3 doctors weighed in
Dr. Todd Purkiss
Ophthalmology 17 years experience
Testing: The most common type of "color blindness" is red-green color deficiency. Blue-yellow deficiency or true color blindness (achromatopsia) are rare. Color testing can identify which. The problem is a lack of certain types of cones or their opsins (light-sensitive compounds). Red-green deficiency can be adapted to fairly easily and is not very limiting, but the others can significantly impact vision.

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Last updated May 16, 2015

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