Lenstore, a UK-based eye care company, has created an ultra-difficult color test that’s so challenging, the retailer says that less than 1% of the first 2,000 people who took it got a perfect ten out of ten.

The test involves distinguishing between different hues of the same color and putting the colors in the correct order on the spectrum.

Lenstore says that women fair better than men on the test. Females scored an average of 57.7%, while men obtained an average of 53.8%. These results closely mirror the current scientific data on sex and color perception.

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