A TIKTOK account known for clever brain teasers and tricky optical illusions has posted a video that few people can figure out.
It’s an eye-catching optical illusion that will have you questioning what you see.
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The TikTok is a classic “what number do you see?” test.
Digits are placed against backgrounds with almost no contrast – only people with extremely sensitive color perception can detect all five from the video.
The video is an example of the Ishihara test, a red-green color blindness evaluator that dates back to 1917.
In a more medical setting, the colored images from the TikTok would be called “pseudoisochromatic plates”.
In a full Ishihara test examination, patients would look at up to 38 different plates, though ophthalmologists can normally determine if someone has color blindness after a couple of examples.
The plates have different functions and some can only be seen by people that are red-green colorblind.
Color blindness can be the product of deficiencies or a lacking of color reading cones in the eyeball, located in the retina.
Dogs only have two of the three cones needed to see the full spectrum of color.
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One in 12 men experiences a form of colorblindness, compared to one in 200 women.
The disparity is because color blindness men need only one parent to be a carrier of the color blindness gene, and women need both parents to be carriers.
Remember, TikTok is not a doctor’s office!
If you have difficulty seeing the numbers in the video, you can ask your doctor for an official exam.
