Health & Fitness

How Color Blindness Works

Roses are red, violets are blue. Well, it’s bluish. The sky is also blue. The grass is green. These are things that most of us know to be true and don’t ask. But what about color blindness? What will you see? Is life a long black and white movie?

In “The Wizard of Oz,” Dorothy Gale walks out of a black-and-white Kansas farmhouse and walks into the colorful Land of Oz She moves from the mundane beings of chores and troubles to an intense fantasy land inhabited by curious creatures. She trades yellow brick roads, red ruby ​​slippers, and a glowing green city of emeralds in a clapboard house. What would her transformation be without this rainbow color?

Color is not just a component of vision. We associate color with beauty, like a gorgeous sunset. Some colors have meaning on their own. Purple means royalty and red means passion. Color permeates our facial expressions. When we are depressed, we say we are in a depressed mood. We can also be “green in envy” and “see red” and” white in fear “. Color also has a practical meaning. Red means stop and green means move.

Certain colors help you sleep while others make you hungry. And never underestimate the effectiveness of a bright red dress. Color is important.


  • Types of color blindness
  • What color blind sees
  • Color blindness test
  • Causes of color blindness
  • What color blindness can do?

Types of color blindness

The part of the eye that detects light and processes color vision is called the retina. The retina has rods and cone-shaped structures. Rods help you see in low light; cones help you see color and detail. Rods and cones contain photosensitive chemicals. In rods, this chemical is rhodopsin. The chemicals in the cones are called photopigments. There are three types of cones, and each cone has a different photopigment that is sensitive to specific wavelengths of light. Normal human vision is called trichromatic because most of us have all three types of cones.

Color blindness is a misleading term. It makes everything black and white. Colorblind contacts can describe the condition more clearly. There are different types and severity of color vision problems. Red-green vision defects are the most common.

People with mild color vision deficiency have anomalous trichromatism, meaning they have all three types of cones but one of them is defective. While people with deuteranomaly have the most severe type of color blindness, which is also the most common, people with deuteranomaly have unusual red cones and protanomaly have unusual greens. People with deuterium vision may not even know that colors are not seeing normally. Tritanomaly, which has trouble distinguishing between blue and yellow, is very rare.

People who lack both types of cones have dichroism, which is more severe than anomalous trichromatism. There are three types within the category of dichroism vision.

  • Deuteranopia: no green cone (also called L cone in sensitivity to long-wavelength light)
  • Protanopia: no red cones (M or mid-wave cones)
  • Tritanopia: no blue cone (S or short wavelength cone)

Solid color is the next step on the color vision ladder. Black and white see life in black, white and shades of gray. There are two types of solids: rod solids and cone solids. People with rod monochromatism, also called achromatopsia, have very poor vision and a high sensitivity to light. They also have nystagmus, which causes the eyeball to shake slightly.

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