I wonder why there's such a big degree in difference between the two claims.
Re:Why we're blind to the color blue
by jbluepolarbear on Saturday July 17, 2021 @09:32PM
(#27870146)
The 30-60% is most likely for those affected by their astigmatism. Astigmatism is when the eye isn’t a perfect sphere. Many people have very slight astigmatism and don’t require correction.
https://patient.info/eye-care/astigmatism