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The IR touch beams aren't aimed at your eye, they're aimed across the screen.
The sorts of levels of radiation that cause cataracts are massive - hence the moniker "glassblower's cataract". However, glassblowers were exposed to a wide spectrum of radiation (and toxins), not just infrared, so it's not at all clear that even those huge doses of IR were causative.
Your best bet when it comes to reducing your risk of cataracts is to not smoke, and always wear good sunglasses & a hat outside. Or don't get old. That works too.
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