Color blindness is the incapability to distinguish between different colours. It comes in a variety of flavours, the most common of which is red green colour blindness. There are several causes, but colour blindness is primarily inherited through a faulty X chromosome. Because men only have one X chromosome, if they are born with a faulty X chromosome (via a carrier mother), they will be colorblind. Women, on the other hand, have two X chromosomes, which explains why they are less colorblind than men. The chances of both X chromosomes being faulty are extremely low, and the healthy one will take precedence, providing normal colour perception.

Symptoms Of colour blindness

You could have a colour vision deficiency and be unaware of it. Some people discover they or their child has the condition when it causes confusion, such as when they have difficulty distinguishing between the colours in a traffic light or interpreting color-coded learning materials.

Colorblind people may not be able to tell the difference between:

• Any colour is acceptable.
• Various shades of red and green
• Various shades of blue and yellow

The inability to see certain shades of red and green is the most common colour deficiency. A person who is deficient in red-green or blue-yellow isn’t always completely insensitive to both colours. Mild, moderate, and severe defects are all possible.

Causes Of colour blindness

Light enters your eye through the cornea and travels through the lens and the transparent, jellylike tissue in your eye (vitreous humour) to wavelength-sensitive cells (cones) in the macular area of the retina at the back of your eye. Cones are sensitive to light with short (blue), medium (green), or long (red) wavelengths. Chemicals in the cones cause a reaction, sending wavelength information to your brain via your optic nerve.

Color is perceived by your eyes if they are normal. However, if your cones are missing one or even more wavelength-sensitive chemicals, you would be unable to distinguish between the colours red, green, and blue.

There are several causes of colour blindness:

• Several medications. Some medications, such as those used to treat autoimmune diseases, heart problems, high blood pressure, erectile dysfunction, infections, nervous disorders, and psychological problems, can cause colour vision to change.
• Aging. As you get older, your ability to see colours slowly deteriorates.
• Disorder is inherited. Males are much more likely than females to have inherited colour deficiencies. Red-green deficiency is the most common colour deficiency, with blue-yellow deficiency being much less common. It’s unusual to have no colour vision at all.
• You can be born with a mild, moderate, or severe form of the disorder. Color deficiency is usually inherited in both eyes, and the severity does not change over time.
• Chemicals. Some workplace chemicals, such as carbon disulfide and fertilisers, can cause colour vision loss.
• Diseases. Color deficits can be caused by a variety of conditions, including sickle cell anaemia, diabetes, multiple sclerosis, glaucoma, Parkinson’s disease, macular degeneration, Alzheimer’s disease,  chronic alcoholism, and leukaemia. If the underlying disease can be treated, one eye may be more affected than the other, and the colour deficit may improve.

Types of colour blindness

Blue-Yellow colour blindness

This less common type of colour blindness makes it difficult to distinguish between blue and green, as well as yellow and red.

Blue-yellow colour blindness is classified into two types:

1. Tritanomaly makes it difficult to distinguish between blue and green, as well as yellow and red.
2. Tritanopia is the inability to distinguish between blue and green, purple and red, and yellow and pink. It also makes colours appear less vibrant.

Total colour blindness

You cannot see colours if you are completely colorblind. This is also known as monochromacy, and it is extremely rare. You may also have difficulty seeing clearly and be more sensitive to light, depending on the type.

Red-green colour blindness

The most popular type of colour blindness makes it difficult to distinguish between red and green.

Red-green colour blindness is classified into four types:

• The most common type of red-green colour blindness is deuteranomaly. It intensifies the redness of green. This type is mild and usually does not interfere with normal activities.
• Protanomaly causes red to appear more green and less vibrant. This type is mild and usually does not interfere with normal activities.

Both protanopia and deuteranopia make it impossible to distinguish between red and green.

Conclusion

Color (colour) blindness (colour vision insufficiency, or CVD) affects approximately one in every twelve men (8 percent) and one in every 200 women worldwide. In the United Kingdom, this translates to approximately 3 million colorblind people (about 4.5 percent of the total population), the majority of whom are men. There are approximately 300 million people worldwide who are colorblind, which is nearly the same as the entire population of the United States!

Color blindness can be caused by a variety of factors. The vast majority of people with poor colour vision have inherited the condition from their mother, though some people become colorblind as a result of other diseases such as diabetes and multiple sclerosis, or they develop the condition over time due to environmental factors.