Colorblindness is a condition where individuals have difficulty perceiving certain colors or distinguishing between colors. Our eyes have cones which contain various pigments called photopigments. These photopigments allow our eyes to see colors. When these photopigments are faulty and don’t show all the pigments, that is when someone is considered colorblind 1.
While commonly a genetic condition, other factors can contribute to colorblindness. Some of these factors include when one suffers damage to the optic nerve, physical or chemical damage to the eye, any damage to the parts of the brain that process color information, and even factors like cataracts and age 1.
Here is a breakdown of the different types of colorblindness:
- Deuteranomaly: This is the most common type of colorblindness that occurs when the green cone photopigments do not work as they should, causing yellow and green to look red, and difficulty distinguishing between blue and purple.
- Protanomaly: This is when the red cone photopigment is affected. Colors appear duller, and orange, red, and yellow appear to have a greenish tint.
- Protanopia: This is where there are no red cone cells, so anything that is red looks gray.
- Deuteranopia: This is where there are no working green cone cells, so anything green looks beige.
- Tritanomaly: Blue cone cells are limited to where blues appear green, and it is difficult to tell the difference between red, yellow, and pink.
- Tritanopia: This is when there are no blue cone cells, and blue looks green, yellow looks light gray or violet.
- Cone Monochromacy: This occurs when 2 of your 3 cone cell photopigments do not work properly. This makes it very difficult to tell one color from the other.
- Rod Monochromacy: None of the cone cells have photopigments, resulting in the world appearing in black, white, and gray. This is the most severe type of colorblindness and is also known as achromatopsia1.
It is worth noting that colorblindness doesn’t necessarily mean seeing the world in grayscale; most colorblind individuals can still perceive a range of colors, but in a more muted or altered palette. Certain colors may appear similar or indistinguishable to them. The experience can vary from person to person, and some may not even realize they are colorblind until they encounter situations that highlight their difficulty with color perception.
People experiencing colorblindness may encounter challenges in daily life, like choosing clothes that match, interpreting color-coded information such as traffic lights), or enjoying certain forms of art.
While there is no cure for colorblindness, most people with color vision deficiency don’t have problems with everyday activities. They develop strategies to compensate for their condition, such as relying on patterns, shades, or context cues to identify colors. Special contact lenses and eyeglasses may help colorblind individuals tell the difference between colors. They work by increasing the contrast between colors so they’re easier to tell apart. Finally, there are now mobile applications that allow people to take photos with a phone or tablet and then tap on part of the photo to find out what color it is. Colorblindness is a commonly misunderstood condition, where many people assume it is just living life without being able to see any color at all. We put together this article to help shed light on the complexity of colorblindness and help everyone understand what it is like to live with color vision impairment.
Sources:
1: https://www.webmd.com/eye-health/color-blindness#:~:text=it%20is%20rare.-,What%20Causes%20Color%20Blindness%3F,chemical%20damage%20to%20the%20eye
2: https://my.clevelandclinic.org/health/diseases/11604-color-blindness
3: https://www.hopkinsallchildrens.org/Patients-Families/Health-Library/HealthDocNew/What-It-s-Like-to-Be-Color-Blind
4: https://www.nei.nih.gov/learn-about-eye-health/eye-conditions-and-diseases/color-blindness#:~:text=Usually%2C%20color%20vision%20deficiency%20runs,people%20see%20differences%20between%20colors.