What is color blindness?
Color blindness should not be mistaken with blindness. It is simply the inability to differentiate between certain colors such as blue and yellow or red and green. It is therefore supposed to be color vision deficiency. This deficiency occurs due to absence of color-sensitive pigment in the cone cells of. . . .+
Color blindness is a condition in which a person is unable to differentiate between colors. Color blindness is not a form of complete blindness instead it is a deficiency which doesn’t allow a person to see certain specific colors such as yellow and blue or red and green.
Dr Shinobu Ishihara from Japan introduced the most popularly known color blindness test in 1917. The test is a color perception test for red-green color deficiencies. It consists of a set of colored dotted plates (PseudoIsochromatic Plate or PIP), each of which shows certain numbers or patterns such as random lines.
Scientists are now able to grow human retinal cells in the lab. This is a big atempt to understand the basis of color vision in humans and to understand color blindness and other retinal disorders. The research is believed to help develop future therapies for eye disorders such as color blindness or macular degeneration, diabetic retinopathy, age-related damage etc.
Retina is the light-sensitive layer of tissue that surfaces the inside of your eye. Color blindness is caused by a difference in how the light-sensitive cells found in the retina of the eye respond to certain colors. These cells of the retina that enable color distinguishing are called cones.
Photo-pigments in cones help in viewing all possible colors. Any defect in cones lead to color vision deficiency or color blindness. Quantitative tests such as Ishihara test, etc are mainly used to analyze color vision deficiency and color blindness.
Color blindness is a defect which occurs when the retina has fewer or none of at least one type of cone. This leads to loss of color spectrum. Research on monkeys and mice prove that gene therapy will benefit humans also but, there are some risks associated with it.
Colorblindness is often an inherited condition but if we specifically look for blue yellow colorblindness, more cases are occur as a result of non-genetic factors. It is a rare condition and is estimated to occur in about 1 in 30-50,000 persons.
There are three main kinds of color blindness broadly based on the types of photopigment defects that may be present in the three different kinds of cones of your eyes that respond to the different lights – blue, green, and red light. The cones recognize these lights based on their wavelengths. Check out how red blue color blind people perceive these colors.
Scientists are working to find a cure for colorblindness and understand the condition better. However, as yet, there is no cure for it. A doctor can recommend you one of these things to manage the condition better so as not to affect your daily life activities. Read for more.
Studies have shown that about 7 % of all men suffer from color blindness and only about 0.4- 1% of all women experience colorblindness. The chance of colorblindness in women is less, but more number of women can be carriers of the faulty gene that leads to colorblindness.