Color blindness causes and test – Many people who are not aware of their suffering from color blindness, especially in children. Well, to make sure an abnormality in this vision, can be done by doing a test of color blindness. Color blindness is one of the vision problems. Sufferers of color blindness can’t see any colors with clear and accurate. They may find it difficult to distinguish some colors, such as red-green, red-yellow-green, or blue-yellow. This kind of problems is known as partial color blindness. Even on some, not at all able to recognize colors, or total Colorblindness.
Color blindness causes and test.
Causes of color blindness.
In General, color blindness caused due to genetic inheritance. However, sometimes the color blindness can also be caused by a variety of other factors. Such as, the existence of a physical injury or exposure to chemical substances, the presence of damage to the optic nerve, or any damage to the function of the parts of the brain that processes the color information. It could also be caused due to cataract, and the aging process in old age. Color blindness can also be caused by a disease, such as diabetes, glaucoma, or multiple sclerosis.
Various types of color blindness test.
In addition to addressing the problems in vision, color blindness tests are also important is used to filter the applicants in the field of work that is concerned with the ability of perception of color. For example, in the law enforcement profession, military, engineering, or electronics, to medicine.
Here are some color blind tests that can be done to diagnose this disorder.
- Ishihara Test.
This is the most common test used to check for color blindness. Unfortunately, these tests can only detect the red-green color blind. Ishihara color blindness test using a circle made up of many dots with different colors and sizes. Some points will form a certain number.
- Cambridge color test
This test is the same as an Ishihara color blindness test. The difference is, the patient is using a computer screen. They were asked to identify the “C” letter that contrasts with the color of the surrounding colors.
- Preparation test
In this preparation test, the patient is asked to draw up an object based on a slight color gradations. For example, the patient is asked to draw up a beam of dark blue-light blue-blue gradations.
To do this it takes a color blindness test tool similar to a microscope. Through the lens on the tool, the patient is asked to see a circle divided into two colors, half bright yellow, half red and green. The patient is asked to press on the tool until the entire color in this circle transforms into the same. Just like the Ishihara test, anomaloscope can only diagnose red-green color blindness.
- Farnsworth-Munsell test.
Farnsworth-Munsell tests using the lots of circles with different gradations of the same color, such as preparation test. This test is done to check whether the patient can distinguish very thin discoloration. If we feel have problems in seeing or recognizing colors, then it is advisable to consult with an ophthalmologist immediately. Although there are limitations, but generally color blindness sufferers still can do a variety of activities normally. Most of the activity which involves the perception of color can also be traveled with a special adjustment.
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