Making a buck cleaning Lester's spittle trays on Sequels' 22-year old supermodel abs

[Shape Shifter]

Originally posted by dtb
Can someone who is higher than a yellow-belt in google-fu please help me find the answer to the burning question:

What percentage of the population over the age of 30 [this is flexible -- it could be 25, 35, whatever, just not over 50] needs corrective eyewear?

Probably easiest to find the answer for the US population, but any population will do.

(Yes, I tried, and came up with bupkus.)

"60% of all Americans and 90% of people above the age of 43 require corrective lenses."

http://www.mylibertycard.com/group/facts.htm