Introduction to Color Blindness

The inability of the human eyes in which they won’t be able to perceive red, yellow, blue or green colours, is called the colour blindness. Colour blindness is not any form of blindness but it is the inability or deficiency of the way a person sees colours.

Normally, any person who is colour blindness will have trouble seeing one or two colours and they will perceive them in a different way in comparison with the person with normal colour vision.

For example, if a person has blue-yellow colour blindness, then they may see these colors red and green.

When any person watches an object, it’s image is being projected on the screen which is called retina and is located at the back of the eyes. Retina is a neural membrane line which is made up of two types of photoreceptor cells which are known as rods and cones.

These are responsible for perceiving objects which are in the dark or at night and won't be able to perceive color. Approximately, there are 120 million rods present in each retina. Cones are responsible for perceiving the colors in the presence of light.

Types of Color Blindness

The type of color blindness can be determined by the functioning of the cones. The types of color blindness are as follows –

Monochromatism:

Any person who is having monochromatism will not be able to distinguish between any color, which is usually because of the absence or total malfunction of the cones present on the retina.

A person will be able to distinguish the color objects according to their brightness. This type of blindness is very rare and it occurs usually in the combination with other problems related to vision.

Dichromatism:

Any person who is having dichromatism usually has two functional types of cones and the third type of cones will be missing or not functioning properly.

This results in not perceiving a specific section of the light spectrum to which the missing cones are very sensitive.

Deuteranopia (Green Color Blindness ):

In deuteranopia, the green cone cells which are present in the retina are missing or non functional.

When a person is having this particular problem, the mixture of green and red colors are being presented in front of that person and will not be able to make out any difference between those colors.

Tritanopia (Blue Colour Blindness ):

A person with tritanopia is deficient in blue cone cells and is not able to distinguish between the yellow and blue colors. This type of blindness is very rare.

Trichromatism:

Trichromatism is a type of color blindness in which all the three types of cells function who perceive light and colors, there used to be a shift in the sensitivity of the wavelengths in one of those colors.

Causes of Color Blindness

Color blindness can be caused because of chronic diseases like diabetes, etc. It can be caused when the medications are being used for a very long time specially those help in the treatment of the nervous disorders.

It can also be caused if any accident has happened and which has caused any damage to the eyes or has restricted the supply of the blood to the eyes. Color blindness can be caused because of the age as it is a part of physical changes.

It is mostly caused due to inheritance. It usually comes from parents. The X chromosome carries the gene which is responsible for color blindness. Due to this, men get more affected.

But some severe accidents, illness, and medication can also cause color blindness. The healthy eye retina of humans consists of rod and cone cells. So if these cells fail to perform then it leads to color blindness. If a person’s eyes have no cones or only one cone, it causes monochromacy.

Dichromacy is caused if one type of cone is missing. When all cones are present but not aligned, it causes anomalous trichromacy in these cases.

How to Check Color Blindness?

To measure color blindness in people there are some diagnoses available for them. These tests include the Ishihara plate test and screen testing.

Ishihara Plate Testing:

It is considered to be the most common color vision screening. It is a well-known process that is used in schools and also in eye clinics. In this test, a circle is created with two colored irregular dots. Here, the total plate is 38. In this process, patients have to find the total number on the plates

Screen Testing:

It determines the types of color blindness one is having. The severity of the syndrome is detected by this testing.

Treatment of Color Blindness

To date, no cure has been invented for color blindness. One can use glasses or contact lenses that are available with filters, and it helps in curing color deficiencies if necessary. In daily life, people with red and green color blindness can face a few problems like choosing fresh vegetables, fruits, etc.

Most color-blind people’s vision is normal; all they require is a certain adaptation. People who have this syndrome can follow a properly balanced diet.

Symptoms of Color Blindness

1. The child can have a difficulty in choosing the red and green color crayons or pencils.

2. In coloring activities, the child pays less attention or patience towards it.

3. The child uses the wrong colors in the coloring workbooks.

4. The child denies any decisions which are based on any colors.

5. The child is showing a lack of interest in the activities which are related to color.

The color discrimination of the child gets worse when the light is dim. Some children may also have sensitivity to the bright lights.

What’s The Cure?

Now, many of you might be wondering that what exactly can you do if you are color blind because this is something that is inherited and a person has no control over it.

Well, to be honest, there isn’t anything you can actually do about color blindness, sadly, you just have to live with it.

A gene therapy experiment was done on monkeys who were color blind and it was successful but scientists are still trying hard to experiment this therapy on humans, they are just afraid that the gene therapy can have some negative effects on the human brain, so nothing yet can be said about it at the moment.

It is said that color blindness is found more in men than women because men have only one X chromosome and they are prone to color deficiency because it’s easy for them to acquire it.

There are some other rare cases in which a person can acquire color blindness, for example if you know someone who is suffering through long-standing diseases such as multiple sclerosis or diabetes then yes, they do have high chances to fall victim to this disease.

Cure of Color Blindness Naturally

Cure of Color Blindness Naturally