Analysis finds rise in nearsightedness

December 14, 2009 An analysis from the National Eye Institute finds a sharp increase in nearsightedness or myopia over the last 30 years.

The most recent data shows 42 percent of Americans are nearsighted. That's compared to just 25 percent back in the early 70s.

Why the increase?

There are multiple theories. Some say more people are now genetically susceptible to myopia. Others blame the increase on long hours spent in front of computer screens, possibly changing the shape of our eyeballs.

The one plus: myopia is easily corrected with glasses, contacts or laser surgery.