An Ishihara color vision test for detection of red-greeen color deficiencies depicting a green word “gay” that will not be differentiated from the tan dots for those with the green-red deficiency
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[–] 13 points 1 year ago

A surprising number of people don't find out till they get a health checkup for work somewhere in their 20's or 30's. Some chemical exposure can slowly cause colourblindness, especially solvents and heavy metals, so people get checked for it, and plenty find out they've apparently always been colorblind.

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