Millions of people around the world wear glasses and contacts for bad eyesight. But that term is so broad that it covers everything from mild farsightedness to those who are legally blind.
But what is actually considered bad eyesight? And when is it considered legally blind?
We’ll answer both these questions and more in our full guide below.
What is normal or 20/20 vision?
Normal vision (or normal visual acuity) is typically 20/20, which means you can read the eighth row of a Snellen eye chart at a distance of 20 feet.
See this in action in the video below from VSP Vision Care’s Youtube channel.
Only about 35% of adults have 20/20 vision, and not every deviation from that number causes concern or need for correction. But you need at least 20/40 vision to pass an eye test to drive without corrective lenses.
The higher the second number, the stronger correction you need.
What is Bad Eyesight?
The World Health Organization categorizes visual impairment in the below...
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