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Color vision deficiency
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Color vision deficiency

Color vision deficiency, often called color blindness, is a group of conditions that impair the perception of color without necessarily affecting visual acuity.

Overview

Color vision deficiency affects how individuals perceive color. The most common forms are red-green defects, while blue-yellow defects are rarer. A more severe form, blue cone monochromacy, results in significantly reduced visual acuity and color perception, often accompanied by light sensitivity and involuntary eye movements.

Types and Causes

The condition is caused by mutations in the OPN1LW, OPN1MW, and OPN1SW genes, which provide instructions for making opsin pigments in the cone cells of the retina.

  • Red-green defects: Caused by genetic changes in OPN1LW or OPN1MW, leading to an absence or malfunction of L (long-wavelength) or M (middle-wavelength) cones.
  • Blue-yellow defects: Caused by mutations in OPN1SW, leading to the destruction or dysfunction of S (short-wavelength) cones.
  • Blue cone monochromacy: Occurs when both L and M cones fail to function, leaving only S cones functional.

Some deficiencies are acquired rather than inherited, resulting from eye diseases, optic nerve damage, or exposure to certain drugs or chemicals.

Inheritance

Red-green color vision defects and blue cone monochromacy are inherited in an X-linked recessive pattern. Because these genes are on the X chromosome, males are affected much more frequently than females. Blue-yellow color vision defects are inherited in an autosomal dominant pattern, affecting males and females equally.

Frequently Asked Questions

Label items with patterns or textures in addition to color, use high‑contrast color combinations (e.g., dark text on a light background), and choose color palettes that are friendly to red‑green or blue‑yellow deficiencies (e.g., blue‑green or orange‑yellow). Many software programs allow you to customize color schemes, and some operating systems have built‑in color filters. Informing teachers, employers, or colleagues about your needs can also lead to helpful accommodations such as color‑blind friendly charts or the use of symbols.
Genetic testing for common mutations in the OPN1LW, OPN1MW, and OPN1SW genes can confirm the type of color vision deficiency. Because red‑green and blue‑cone monochromacy are X‑linked recessive, males are more often affected, while females can be carriers. Blue‑yellow defects are autosomal dominant. If you are a carrier or affected, genetic counseling can help you understand the likelihood of passing the condition to your children and discuss options such as prenatal testing or pre‑implantation genetic diagnosis.
Most inherited color vision deficiencies remain stable throughout life; they do not typically worsen. Acquired deficiencies can improve if the underlying eye disease or medication is treated. There is currently no cure that restores normal color perception for inherited forms, but adaptive strategies—such as using color‑coding, contrast enhancement, or specialized lenses—can help compensate for the deficit.
You can use a smartphone app that displays a series of color plates or a paper test like the Ishihara plates for red‑green defects. For blue‑yellow defects, a test such as the Farnsworth‑Munsell 100‑color arrangement or a specialized online test that includes blue‑yellow discrimination can be used. These tests are quick, inexpensive, and give you a preliminary idea of which cone type is affected. If the results are unclear, a comprehensive evaluation by an optometrist or ophthalmologist with a color vision test battery is recommended.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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