Low Vision Blog
What Does 20/20 Visual Acuity Really Mean?
If you’ve been to the eye doctor lately, you may have heard what you measured that day in terms of visual acuity. 20/20 is what we consider unimpaired vision- but what exactly does that mean? Well, of course I could give you all the jargon and mumble jumble related to size measurement and all that, but I have an easier way of explaining it.
Technically, someone is deemed “Low Vision” if they are 20/70 or poorer in the better eye. In comparison to unimpaired vision (20/20), someone with low vision of 20/70 has to move as close as 20 feet to an object that I can see at 70 feet with unimpaired vision. We really need to think in terms of clarity and detail here. For example, with macular degeneration, maybe you measure 20/100. Ok, so that tells us, you see 5 times less clearly than your counterpart that views with 20/20 vision. Or, we can say I can see something at 100 feet that you have to be as close at 20 feet to see.
Low vision rehabilitation can help you with using your remaining vision more efficiently; from very mild impairment of 20/40 to severe impairment of 20/400 and poorer.
20/70: Low Vision
20/200: Legal Blindness
20/2000: Near Total Blindness
No Light Perception: Total Blindness