Ishihara Test, Here's What You Should Know

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Ishihara Test, Here's What You Should Know
Ishihara Test, Here's What You Should Know

Ishihara test is a test performed to check the eye's ability to see and distinguish colors. This test is most often used to detect color blindness, whether it is total or partial color blindness

Color blindness does not always cause the sufferer to see all colors as gray. Color blindness like that is actually rare. People who are color blind are generally only unable to distinguish between certain colors, for example, to distinguish between red and green, or blue and yellow.

Ishihara Test, Here's What You Should Know - Alodokter

The Ishihara test can be used to find out if a person is color blind. This color blindness test can be done in a hospital by an ophthalmologist or done yourself at home.

Although it can be done independently, if the results of a home examination indicate a color blind condition, it is advisable to immediately consult a doctor to confirm the diagnosis.

Ishihara Test Indication

Ishihara test can be done on everyone. However, doctors usually recommend the Ishihara test in people with the following conditions:

  • Has a family member who suffers from color blindness
  • Has difficulty distinguishing colors, for example, can't tell the difference between green and red
  • Has difficulty seeing whether a color is bright or not, for example not being able to tell the difference between light yellow and light yellow
  • Has difficulty distinguishing shades of color, for example unable to distinguish red from purple

Ishihara Test Warning

As previously explained, the Ishihara test can be performed on anyone. However, in some cases, this test may need to be preceded by other eye examinations, such as in people with vision problems that are severe enough to not see clearly.

Therefore, inform your doctor in advance if you have vision problems, both to see color and to see as a whole. Also tell your doctor about any other complaints you have, a family history of eye he alth, and any medications or supplements you are currently taking.

Before Ishihara Test

The Ishihara test does not require any special preparation. If the patient uses glasses to see, it is recommended to wear glasses when performing this test.

Ishihara Test Procedure

The Ishihara test was conducted in a room with sufficient lighting. The ophthalmologist will perform tests on both eyes of the patient one at a time. In the process, the patient will be asked to close one eye and look at the image on the test paper.

The complete Ishihara test generally consists of 38 picture cards. If only for screening purposes (pre-test), fewer cards can be used.

On each card there is an image of a circle formed from dots with different colors, brightness levels, and sizes. The dots can form a pattern of numbers, letters, symbols, or grooves. During the test, the patient must read the letters or numbers in the picture with one eye closed.

After finishing with one eye, the doctor will ask the patient to close the other eye and perform the same test as before. In addition to finding the letters or numbers in the picture, the doctor may also ask the patient to describe the brightness of the colors seen.

After Ishihara Test

Ishihara's test results are generally available as soon as the test is completed. The test results can help doctors detect some conditions of color blindness, such as:

  • Protanopia, which is difficulty distinguishing green from blue or red
  • Deuteranopia, which is difficulty distinguishing purple from red or green
  • Achromatopsia, which is total color blindness, where the sufferer can only see the color gray

If color blindness is found, the doctor may order additional tests to confirm the diagnosis. Doctors can also perform further tests to determine whether color blindness is caused by a disease, such as diabetes or glaucoma.

Ishihara Test Risk

Ishihara test does not cause any side effects or complications. This test is safe for anyone to do and is effective for detecting eye problems in seeing color.

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