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Wait are you saying that an optometrist certified 20/20 is not perfect vision? I'm curious because I don't have perfect vision (I'm at -0.5 on both eyes) but I
by isatty 9y ago
Wait are you saying that an optometrist certified 20/20 is not perfect vision? I'm curious because I don't have perfect vision (I'm at -0.5 on both eyes) but I can read most things just fine (just not far away stuff). I find that websites regularly have small font sizes. I use a 2K UHD monitors (U2515H x2) at an arms length and I zoom both HN and reddit to read them with ease.
- robin_reala 9y ago20/20 is ‘normal’ vision. To quote Wikipedia: A reference value above which visual acuity is considered normal is called 6/6 vision, the USC equivalent of which is 20/20 vision: At 6 meters or 20 feet, a human eye with that performance is able to separate contours that are approximately 1.75 mm apart.[4] Vision of 6/12 corresponds to lower, vision of 6/3 to better performance. Normal individuals have an acuity of 6/4 or better (depending on age and other factors).
- finnh 9y agoI'm not drawing distinctions between "normal" and "perfect" here. My point is that 20/20 refers to what you can see at a distance of 20 feet, which is different from what you can see at a distance of 2 feet. Huge numbers of senior citizens have 20/20 or better vision but still can't read a computer monitor without reading glasses.
- deleted 9y ago[deleted]
- red75prime 9y agoPresbyopia. Human's eyes gradually lose ability to focus on nearby things. Past 40 it begins to be a nuisance.