What cause of the color blindness?

The most common cause of color blindness is a deficiency in the cone cells in the retina. The cone cells are responsible for detecting different colors of light, and having a deficiency in one or more of these types of cells can result in color blindness.

There are three main types of cone cells: long-wavelength-sensitive (L), medium-wavelength-sensitive (M), and short-wavelength-sensitive (S). Color blindness occurs when one or more of these cone types is absent or not working properly. The most common form of color blindness is red-green color blindness, which is caused by a deficiency in the red or green cone pigment.

Color blindness can also be caused by damage to the optic nerve or brain, such as from a stroke, brain injury, or certain eye diseases.

Other causes of color blindness include:

- Age-related changes in the retina

- Use of certain medications, such as digitalis and quinine

- Diabetes

- Alcoholism

- Multiple sclerosis

- Parkinson's disease

- Alzheimer's disease

Color blindness is usually not a serious medical condition, but it can affect a person's ability to perform certain activities, such as reading maps, distinguishing between certain colors of food, and matching clothing. There are a number of different tests that can be used to diagnose color blindness.