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There are different degrees of color blindness.
Some people have mild color blindness. They can see normal colors in good light but have difficulty in dim light.
In more severe cases, they cannot distinguish certain colors in any light.
The most severe form of color blindness is when everything is seen in shades of gray, which is very rare.
Color blindness usually affects both eyes equally and remains stable throughout life.
Completely color blind
You don't see any color at all, and your vision may not be clear.
There are two types:
Total cone color blind test ness: It happens when two of your three cones—red, green, or blue—don't work. When only one type of cone is active, it can be difficult to distinguish one color from another. And if one of your faulty cones is blue, your vision may not be as sharp. You may be nearsighted and experience uncontrolled eye movements. This is a condition known as nystagmus.
Total rod color blindness is the most severe form of color blindness. None of your cones have active light-sensitive pigment. As a result, the world appears to you in black, white, and gray. Bright light can hurt your eyes. You may have uncontrolled eye movements (nystagmus).
There is currently no cure for this disorder. Especially when it's hereditary.
Several methods can be used to increase the perception of color in sufferers such as:
Use a color filter based on the Bragg filter. While these lenses are effective, they are expensive, bulky, and incompatible with other types of vision correction eyeglasses.
In addition, there has been research on a rhodamine derivative incorporated in commercial contact lenses to filter out specific wavelength bands (≈545-575 nm) correcting color vision blindness. Evaluation of the biocompatibility of stained contact lenses in human corneal fibroblasts and epithelial cells revealed no toxicity and cell viability remained at 99% after 72 h. This study demonstrates the potential of dyed contact lenses in wavelength filtering and the management of color vision deficiency.

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