Prescription Glasses

(credit: CBS)

Good Question: Why Do So Many Of Us Need Glasses?

In the last 30 years, the number of us who are nearsighted has doubled. So, why do so many of us need glasses? The answer may have something to do with what we’re seeing so much of.

06/22/2011

Follow

Get every new post delivered to your Inbox.

Join 2,330 other followers