By Bob Condor

More Americans are having trouble reading eye charts. That’s the bottom-line finding from a study published earlier this month in the Archives of Ophthalmology medical journal. Nearly half of all U.S. adults have some sort of vision problem, far greater than any previous estimates. One difference is a much larger number of people with nearsightedness or myopia.

Interestingly, the new stat aligns more closely with other countries’ collective adult vision For instance, it’s a straight-on match with …