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In my youth I always had perfect 20-20 vision.
Years of photo-editing and staring intently at a screen about two feet away for long periods of time eventually caused my eyes to only be able to focus at that distance. First started noticing it as halos around street lights when I'd drive at night. My depth perception was shot - couldn't judge the distance accurately.
Everything closer or farther away requires glasses now. Progressive trifocals did the trick.
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