Color blindness (Color Vision Deficiency) is the inability to see certain colors. It can be caused by a number of factors, including genetics, aging, and health problems. If you can’t see the numbers in the image below, you may be color blind.
Color blindness is a common condition affecting about 8% of men and about 0.4% of women of the population. The colors that people are most likely to be color blind to are green, yellow, orange, and red. However, some people may have achromatopsia, which means they can only see black and white. However, this condition is very rare.
Color blindness
Color blindness in each person may have different symptoms depending on the type of color blindness that is present, but you may be able to recognize these warning signs.
- Unable to remember and differentiate between different colors clearly, causing confusion in describing the colors seen, such as not being able to differentiate between green and red, but being able to differentiate between blue and yellow easily.
- Can see a wide range of colors, but some colors may be seen differently than others.
- Only certain tones of color can be seen, unlike normal people who can see over a hundred colors.
- In some cases, only black, white, and gray can be seen, but this type of color blindness is rare.
Most symptoms of color blindness can be found since childhood because cells and nerves in the eyes and brain have been developing since birth. Parents may try to observe their children initially. If they find that children over 4 years old start to remember and tell different colors incorrectly or cannot choose objects with different colors, there is a high chance that they have color blindness. Most patients hardly know that they are color blind.
Causes of color blindness
The vision of eye color relies on two types of cells behind the retina to distinguish the colors we see. The first type is the rod cells, which are sensitive to dim light and are used for night vision, but can only see shades of black, white, and gray.
Another type is the cone cell, which is more sensitive to bright light than the rod cell and can clearly distinguish different colors of light. This cell can also be divided into 3 subtypes: cone cells that are sensitive to red, green, and blue light.
In normal people, there are all three types of cone cells that are sensitive to light. Each color sends a signal to the brain to separate the colors and mix the different colors of light from these cells, allowing normal people to see many different tones of colors.
For people who have color blindness, it may be caused by several reasons as follows:
congenital
Genetics is the main cause of color blindness. People with a family history of color blindness may pass the genetics to the next generation through a recessive gene on the X chromosome. This gene is responsible for determining male or female gender.
The male chromosome is XY and the female chromosome is XX. Since color blindness is passed on through the X chromosome, color blindness is more common in males than in females in the offspring generation.
While females may be carriers who can pass the abnormal gene to their offspring, there is also the possibility of cross-generational inheritance, such as color blindness in the mother, who may be a carrier and have color blindness in her grandson instead.
Other causes
In some cases, color blindness may be caused by certain physical conditions, such as:
- Increasing age may result in cell degeneration as we age.
- Eye diseases or injuries to the retina, such as glaucoma,macular degeneration, cataracts , or eye injuries.
- Other diseases such as Alzheimer’s disease, multiple sclerosis, diabetes, or Parkinson’s disease
- Side effects of taking certain medications
- Long-term exposure to certain chemicals, such as carbon disulfide or styrene, can cause loss of color vision.
Color blindness diagnosis
Doctors or ophthalmologists diagnose patients using color blindness test charts to see their ability to distinguish colors. There are many different types of test charts used, but the two most popular types of color blindness test charts are:
- Ishihara Diagrams: Each picture has a different colored dot. The doctor will have the patient look up a number on the picture. If a person with color blindness cannot correctly tell the number from the picture, this method can quickly screen patients, but it cannot tell the severity of color blindness.
- Color Arrangement The patient must arrange the given shades of color, and similar shades must be arranged correctly so that they are close to each other. If the patient is color blind, it may be confusing to arrange the colors correctly.
Treatment of color blindness
There is no cure for inherited color blindness. Your doctor or ophthalmologist may recommend that you wear glasses or contact lenses that filter out some of the light. This will help you see colors more clearly, but it will not give you the same color vision as a normal person.
However, in cases where patients are color blind due to other conditions or diseases such as diabetic retinopathy, doctors will treat the main cause of the disease to help improve overall symptoms and alleviate eye complications.
In addition, doctors may recommend that patients use location memory techniques or use symbols instead of colors in some cases to help make daily life easier, such as memorizing the location of traffic lights in order from top to bottom or using color tags on clothing, which will make it easier for patients to choose the color of clothes.
For children with color blindness, teachers and schools should be informed about the child’s color blindness problem in order to help adjust teaching media that is appropriate for the child so that they can learn more similarly to children with normal vision, including telling the child and those around them that color blindness has occurred and how they should adjust.
Complications of color blindness
Color blindness rarely causes complications, but it can have a slight to severe impact on daily life, especially in certain occupations that require color discrimination and recognition.
For example, drivers, pilots, firefighters, doctors, nurses, hospital lab technicians, pharmacists, or those working in photography can also affect learning development in pediatric patients.
Color blindness prevention
Color blindness cannot be completely prevented, but it can be avoided or reduced from childhood. Children should be screened for color blindness and have their eyes tested at the age of 3–5, or children should have their eyes tested at least once before starting school.
People who have family members who are color blind should have their eyes checked regularly. In particular, those who are planning to become pregnant should consult their doctor about the possibility of passing on color blindness to their children or undergo genetic testing, which may be recommended by their doctor, to assess their risk of developing color blindness in the future.
People who have no history of being related to someone who is color blind should also observe for abnormalities in their own eyesight, as color blindness can be caused by other factors. When you suspect that you have a vision problem or abnormal color vision, you should see a doctor or ophthalmologist immediately to find the cause of the abnormality and receive proper treatment or correction.
