Achromatopsia-testing for colorblindness

Are you color blind?

Ishihara 38 Plates Test
One common test to determine achromatopsia is the Ishihara 38 Plates Test. This test requires the patient to identify a number made of colored dots amongst a background of different colored dots. The different plates have different color combinations to show which photoreceptors are deficient. If no numbers are identified, incomplete achromatopsia is present. Patients that can identify some numbers but not others, suffer from incomplete achromatopsia. Ishihara tests often include a plate which appears to not have a number in the circle, but those who are color blind will be able to perceive a number in that circle. Below is an example of a few Ishihara plates. Can you read them all?

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Figure 3: Example of some plates from the ishihara plate test. Look for a number amongst the dots. The numbers read from left to right: 45,2, you should not see a number in space #3 if you are NOT colorblind, 42 Bottom: 74, 97, 6, 3.

RGB Anomoloscope
The other commonly used test is the RGB Anomoloscope, which can determine level of colorblindness. Patients are asked to match the light intensities in two side-by-side boxes. One box is adjustable using an adjustment bar while the other remains constant. Patients are instructed to stop adjusting the intensity when they believe the colors match. This matching process is then repeated using different colors and intensities. A color blind individual will not be able to correctly match the light intensities, although they will feel as though they have. This testing technique is more complex than the Ishihara test and cannot accurately be recreated on personal computers due to different screen settings and capabilities, therefore self testing is not possible.

Materials and Method
Broader Impacts
Work Cited