This may be useless information… but then again, isn’t spreading marginally useful (albeit entertaining) information the purpose of the internet? Thought so. Proceed!
Can we please stop referring to 20/20 vision as “perfect 20/20″ Vision known as 20/20 is AVERAGE. (Similar to how an IQ of 100 is average. Same idea.)
A micro-lesson
The first number is always 20. If you have great vision, say 20/15, you could read something from 20 feet that an average person could read at 15. The first number is your distance, the second is the “normal” person’s distance.
If you have poor vision, say 20/30, you could read something at 20 feet that an average person could read at 30. You would need to be 10 feet closer (or more generally, 33% closer).
Related: Babies, Blindness, and Hawks
- New babies have something like 20/80 vision
- 20/200 is the cutoff for legal blindness in the United States
- Hawks can have up to 20/2 vision
The next time someone claims “perfect 20/20 vision”, be sure to tell them you have a perfect IQ of 100.
