You cannot distinguish certain colors if you have color blindness. This condition is mostly inherited.
The most common form is red/green color blindness and you cannot distinguish red and green colors. Rare color deficiency is blue/yellow.
Color blindness more prevalent in men:
According to the latest research, one in 12 men and one of 225 women is color blind. The color blindness is more prevalent in men because it is carried on the X chromosome of which men have only one copy.
In men, red or green cones work improperly or not at all work. Genes for red and green receptors are altered in men. These genes lie near each other on the X chromosome. The red/green type affects 8 to 10 percent of men
Ishihara color test
Ishihara color test is conducted to test for red-green color deficiencies. Ishihara color test consists of number of colored plates, each containing a circle made with dots of different sizes with slightly different colors and these dots are spread in random manner. A number is differentiated only by color within the dot pattern.
Visible number indicates the form of color blindness. For full test, thirty eight plates are required, but to find out the deficiency, not more than four plates are required.
Inexpensive color blindness test
To find out the color blindness, tests and screenings becomes very expensive. To overcome this problem, the Color Vision store has released Color Vision Guide.
This guide is useful in health clinics over expensive, bulky color vision tests. The guide is used to screen for common color vision defects. As the guide is printed on single laminated sheet and contains many facts about color blindness, you can enjoy reading the guide while waiting for your exam.
The guide is a non-medical guide to color blindness for parents, children and educators. It consists of clear text and computer generated illustrations of four colors and charts that can be used to test adults and children.
As the colorblindness is overlooked by parents and teachers, the guide raises the awareness of this learning disability by making available of the simple chart.
How to overcome color blindness problem?
For inherited color blindness, there is no treatment. The condition can be improved by surgery. If you are unable to identify the colors due to cataracts, treatment for cataracts can improve the condition. If your problem is due to the side effects of medication, your color vision can be improved by stopping the medication.
You can use specially tinted contact lenses and eye glasses to identify the difference between colors. But, normal color vision is not provided by these lenses and sometimes objects will be distorted.
You can also use glasses that block glare because you can see the difference between colors when there is less glare and brightness. When there is less bright light, you can see well if you have color vision problems.