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Most of us see our world in color. We enjoy looking at a lush green lawn or a red rose in full bloom. If you have a color vision defect, you may see these colors differently than most people.
There are three main kinds of color vision defects. Red-green color vision defects are the most common. This type occurs in men more than in women. The other major types are blue-yellow color vision defects and a complete absence of color vision.
Most of the time, color blindness is genetic. There is no treatment, but most people adjust and the condition doesn't limit their activities.
- Color Blindness (National Eye Institute)
- What Is Color Blindness? (American Academy of Ophthalmology) Also in Spanish
- Achromatopsia (American Association for Pediatric Ophthalmology and Strabismus)
- Achromatopsia: MedlinePlus Genetics (National Library of Medicine)
- Color vision deficiency: MedlinePlus Genetics (National Library of Medicine)
Statistics and Research
- Eye Health Data and Statistics (National Eye Institute)
- Testing Children for Color Blindness (American Academy of Ophthalmology)
- ClinicalTrials.gov: Color Vision Defects (National Institutes of Health)
Journal Articles References and abstracts from MEDLINE/PubMed (National Library of Medicine)
- Article: High-Efficiency CRISPR/Cas9-Mediated Correction of a Homozygous Mutation in Achromatopsia-Patient-Derived iPSCs.
- Article: Clinical and Genetic Features of Korean Patients with Achromatopsia.
- Article: Assessment of visual function and the neuroretina in subjects diagnosed with...
- Color Blindness -- see more articles
Find an Expert
- Ask a Scientist: What Is Color Blindness? (National Eye Institute)
- Color blindness (Medical Encyclopedia) Also in Spanish
- Color vision test (Medical Encyclopedia) Also in Spanish