Let's Recognize Different Types Of Color Blind Tests

Many do not realize he has color blindness, especially in children. To ensure abnormalities in vision, it can be done by doing a color blindness test.

Color blindness is a vision problem. Color blind people cannot see some colors clearly and accurately. They may find it difficult to distinguish between colors, for example red-green, red-yellow-green, or blue-yellow, known as partial color blindness. Even in some people, it is completely unable to recognize color or total color blindness.

Main Causes of Color Blindness

In general, color blindness is caused by genetic inheritance from parents who experience it. However, sometimes color blindness can also be caused by various factors other than genetic, such as:

  • Physical injury or chemical exposure
  • There is damage to the optic nerve
  • The damage to the function of the part of the brain that processes color information
  • Have cataracts
  • Aging process in old age

Color blindness can also be caused by a disease, such as diabetes , glaucoma, or multiple sclerosis .

Understanding Various Types of Color Blind Tests

In addition to dealing with vision problems, color blindness testing is also important to be used to screen applicants in the field of work who emphasize color perception skills, such as law enforcement, military, engineering, or electronic professions, to medicine.

Some color blindness tests can be done to diagnose this vision disorder.

  • Ishihara test 
    This is the most common test used to check color blindness. Unfortunately, this test can only detect red-green color blindness. The Ishihara color-blind test uses a circle consisting of many dots of different colors and sizes. Some points will form a certain number.
  • Cambridge color test 
    This color blindness test is the same as the Ishihara test. The difference is, the patient uses a computer screen. They are asked to identify the letter "C" which is different in color from the surrounding color.
  • Preparation test 
    In this preparation test, the patient is asked to arrange objects based on a slight color gradation. For example, the patient is asked to arrange a beam of dark blue-light blue-blue gradations.
  • Anomaloscope 
    To do this color blindness test, a microscope-like device is needed. Through the lens of the tool, the patient is asked to see a circle divided into two colors, half bright yellow, half red and green. Patients are asked to press the button on this tool until all the colors in this circle change to the same. Just like the Ishihara test, the anomaloscope can only diagnose red-green color blindness.
  • Farnsworth-Munsell Test 
    The Farnsworth-Munsell test uses many circles with various gradations of the same color, just like the preparation test. This test is done to check whether the patient can distinguish very thin discoloration.

If you feel you have problems seeing or recognizing colors, it is advisable to consult an ophthalmologist immediately to do a color blindness test . Although there are limitations, but do not worry, generally people with color blindness can still do various activities normally. Some activities that involve color perception can also be carried out with special adjustments.
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