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(Someone on gaming told me to better post this here.)

So in a lot of games lately I've seen this weird "light interference effect" where objects on the edges of my screen become red and blue blurry. My questions are:

  • What's this effect's name?
  • Why is it there?
  • Why do so many games use it?

Here's a picture of what I mean: https://i.imgur.com/goEW4Vn.png

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