Why myopia is on the rise around the world

A recent study predicted half the world's population will be nearsighted by 2050. Symptoms of myopia can include headaches, eyestrain and squinting. Dr. Christopher Starr, ophthalmologist at Weill Cornell Medical Center, joins "CBS This Morning" discuss what's behind the rising numbers.
Source: Health News: CBSNews.com - Category: Consumer Health News Source Type: news