Color
Blindess

Color blindness is the inability that causes patients to see colors differently than most people.

They usually have the troubles seeing the difference between colors, brightness of colors, and difference shades of colors.

People with normal vision are able to see all combinations of the three additive primary colors — red, blue, and green.

What is Deuteranopia?

Deuteranopia is the type of red-green color blindness. It makes green look more red.
Protanopia is also a type of red-green color blindness. makes red look more green and less bright.

What causes it?

Genetic deficiencies of OPN1LW (red pigment cone) and OPN1MW (green pigment) genes affect with one or more of the three cones: L, M, and S.
They change the way that color wavelengths are detected by the cones.

What is Tritanopia?

Tritanopia makes you unable to tell the difference between blue and green, purple and red, and yellow and pink. It also makes colors look less bright.

What causes it?

OPN1SW gene damage the S cones and create blue-yellow color vision deficiencies.

How to prevent it?

Practice to memorize the orders of colors. The memorization can help brain to identify different colors when it encounters the defects.
Use technology. There are apps for phones and digital devices that can help you identify colors.

Any treatment?

Wearing a colored filter over eyeglasses or a colored contact lens can increase the contrast between the colors so that it is easier to identify.

Reference

Deuteranopia: Red-Green Color Blindness. Healthline. Published November 9, 2020. https://www.healthline.com/health/deuteranopia#causes