The researchers disagree with the World Health Organization which says blindness and other vision problems are the leading cause.

VOA: special.2009.12.28

Nathan Bonilla-Warford is an optometrist in Tampa,Florida, with VSP, Vision Service Plan, a big insurance provider.

VOA: special.2011.08.01

Now,with the vision centers in place, doctors are treating an average of 5,000 patients per center per year.

VOA: standard.2010.05.25

While they agree on E.U.membership, he says,none of the candidates came up with a clear and passionate vision for Croatia's economic recovery."

VOA: standard.2009.12.28

(Speaking) With LASIK,doctors use a laser to permanently change the shape of the cornea to improve vision.

VOA: standard.2010.03.03

It also means coming up with long term vision and cooperation for the future.

VOA: standard.2009.12.08

But some people who have undergone LASIK are left with permanently damaged vision.

VOA: standard.2010.03.03