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My understanding is that 20 feet or so is optical infinity, so whether you're looking at an object 20 feet away or 20 light years away, your eye muscles are jus
by garblegarble 3y ago
My understanding is that 20 feet or so is optical infinity, so whether you're looking at an object 20 feet away or 20 light years away, your eye muscles are just as relaxed (hence the 20-20-20 recommendation: every 20 minutes, stare at an object 20 feet away for 20 seconds)
- antisthenes 3y agoI don't know about you, but where I spent my childhood, most things indoors were much closer than 20 feet away. That's a fairly large room, and we typically don't focus on the furthest point while indoors anyway. So with the 20ft requirement, it's a lot easier to fulfill while being outdoors.
- garblegarble 3y agoOh yeah definitely - I was purely commenting on the parent comment's "really far" claim, and noting that it's all the same to the eye muscles once you hit 20 feet - you don't have to (no pun intended) set your sights on the stars to relax your eye muscles.