This optical illusion could affect your vision for over 3 months if you look at it for too long

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November 7, 2018 6:02 PM

To figure out how an optical illusion works, sometimes you have to stare at it for a while. With the McCollough effect, do so at your own risk.

To figure out how an optical illusion works, sometimes you just have to stare at it for a while. But when it comes to the McCollough effect, do so at your own risk.

The phenomenon was discovered by Celeste McCollough in 1965. McCollough found that staring at colorful gratings for too long can affect vision for months to come. Turns out, looking at these gratings for more than 10 minutes can have the effect last over three months.

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