For what it's worth, 20/20 is a woefully inadequate measurement to claim good eyesight in the context of reading or computer use. (It works well for "can walk a

For what it's worth, 20/20 is a woefully inadequate measurement to claim good eyesight in the context of reading or computer use. (It works well for "can walk around town" or "can drive a car".) Vision works differently at different distances. I have "20/20 vision" (see distant objects at least as well as average), but I also am practically unable to read small print, need reading glasses to read for more than 15 minutes or to read a backlit Kindle in the dark, I sometimes get eye strain headaches if I don't wear my computer glasses, and I'm suffering from glaucoma which, if untreated, will make me blind in a way where I'll likely retain 20/20 vision for a very long time while losing peripheral vision, contrast, and ability to read for more than 15 minutes. The eye, and the nervous system it feeds, is a complex system with various failure modes. If you have eye strain, go see an optician. If they think you should also see an ophthalmologist, do that too. If any of your parents/their siblings/grandparents developed glaucoma, and you're 40+ years, go see an ophthalmologist and tell them who all was affected, it's hereditary.