Our ability to see with color vision depends on the presence and function of light-sensing pigments in the cones of our eyes. Color blindness, or color vision deficiency, happens when one or more of these cones don’t work.
When the long wavelength-sensing pigments of the eyes are missing or don’t function correctly, it causes a type of color blindness called protan color blindness. People with protan color blindness have trouble telling the difference between red and green.
In this article, we’ll discuss what protan color blindness is, and what tests and treatment options are available for those with this type of color blindness.
To understand what protan color blindness is, it helps to learn how the cones of the eyes produce color vision.
Inside the cones of the eyes are certain substances, called photopigments, that sense different wavelengths of light.
Short wavelength cones (S-cones) perceive blue, medium wavelength cones (M-cones) perceive green, and long wavelength cones (L-cones) perceive red.
When the L-cones are missing or dysfunctional, this causes a type of red-green color deficiency known as protan color blindness.
Red-green color blindness affects roughly 8 percent of men and 0.5 percent of women around the world, with the most common type being red-green color blindness. Color blindness itself is caused by an X-linked recessive gene, which is why men are more likely to be affected than women.
This is because men only have one X chromosome, and so only require one genetic change for the condition to occur. Women, however, have two X chromosomes, and therefore would need two genetic changes to have the condition.
There are multiple types of color blindness, and each type can differ in how severely it affects someone’s color vision. Protan color blindness generally causes the eyes to have trouble differentiating between red and green.
The two types of protan color blindness are protanomaly and protanopia.
- Protanomaly happens when the L-cones are present but don’t function properly. As a result, the eyes perceive red as greener.
- Protanopia happens when the L-cones are missing completely. Without the L-cones, the eyes have trouble differentiating between green and red.
The different forms of color blindness, which include protan color blindness, can range from mild to severe.
For example, protanomaly is milder than protanopia and generally doesn’t cause many problems in daily life.
Protanopia, being the more severe form of red-green color blindness, causes a significantly different perception of red and green.
Here’s an image as viewed by a person without color blindness:
And here’s how the same image might appear to someone with protanopia:
A color vision test, or Ishihara color test, uses a series of color plates to test for color vision adequacy. Each color plate contains small colored dots. Some of these colored dots are arranged into a number or symbol in the center of the plate.
If you have full color vision, you will be able to see and identify the number or symbol that is present in the image.
However, if you don’t have full color vision, you may not be able to see the number or symbol on certain plates at all. The type of color blindness that you have determines what you can and can’t see in the plates.
While most eye doctors can provide color blindness testing, there are a handful of major companies that specialize in providing free color vision tests online.
EnChroma, one of the leading companies in producing technology for people with color blindness, has a Color Blind Test available on its website. The test takes less than 2 minutes to perform and will let you know if your color blindness is mild, moderate, or severe.
If you suspect that you have color blindness and feel that you would benefit from an official diagnosis, you can also schedule a color vision test with an eye care professional.
There is currently no cure for protan color blindness. However, there are companies that produce equipment for people with color blindness to help improve their daily lives.
For example, EnChroma glasses have been marketed as a way to improve color differentiation and color vibrancy for people with color blindness. One
The researchers found that the EnChroma glasses did somewhat change the perception of colors that the participants could already see. However, the glasses couldn’t improve diagnostic tests nor restore normal color vision.
If you’re interested in taking advantage of the treatment options available for protan color blindness, you can visit your eye doctor to learn more.
Most people with protan color blindness lead normal lives. However, having color blindness can make certain day-to-day tasks more difficult, like driving, cooking, and using electronics.
Management techniques, such as memorization, lighting changes, and labeling systems, can be a helpful for navigating daily life when you have color blindness.
Practice memorization techniques
Protan color blindness has an especially big effect on driving. Red is a widely used color in traffic signs and signals, from stoplights to stop signs.
Memorizing the order and look of traffic signs and signals can help you continue to drive safely, even with color blindness.
Organize and label your wardrobe
Choosing certain outfit combinations can be difficult with protan color blindness, especially for red and green hues. For people with more severe color blindness, having a friend or family member organize and label clothing can be a huge help.
You can then use the organization and labeling system to distinguish between different colors, which can help when you’re choosing outfits.
Develop your other senses
Smell, taste, touch, and hearing are four of the senses that help us navigate through our daily lives. Outside of other underlying conditions, people with protan color blindness can still use all of these senses for everyday activities.
For example, even without full color vision, smell and taste can be helpful for tasks like cooking food and choosing fresh produce.
Focus on good lighting
Color vision is dramatically reduced in the absence of proper lighting. People with protan color blindness benefit from good lighting because it can help them distinguish between the colors they already see.
Installing natural lighting and daylight bulbs at home and even at work can be a huge help for people with color blindness.
Use accessibility options
Most electronics, such as phones, TVs, and computers, offer accessibility options for people with color blindness. These options can help adjust certain colors on the screen to make it easier to use these devices.
In addition, there are also some apps on the market that can help people with colorblindness identify colors they may not be able to see.
Protan color blindness is a type of color vision deficiency that occurs when the red-sensing pigments of the eyes are either missing or dysfunctional.
There are two types of protan color blindness: protanomaly and protanopia.
Protanomaly is the mild form of red-green color blindness, while protanopia is the more severe form. All forms of color blindness, including protanomaly and protanopia, can be diagnosed through a color vision test.
Even if you have been diagnosed with protan color blindness, small changes to your daily routine can help you live a normal, fulfilling life.