Age-related macular degeneration, or AMD, is the leading cause of vision loss in Americans 65 and older.
Some first notice it when they look at straight lines, such as bathroom tiles.
AMD makes the tiles look wavy and blurred.
A new study finds vitamin D lowers the risk of AMD in women between 40 and 75 years old by as much as 50 percent.
Vitamin D is found in leafy vegetables, milk, cereal, especially oatmeal, and fish.