Alaskan Cod and Halibut (photo courtesy of Library of Congress, before 1927)

If you want to preserve your eyesight while aging you should eat two 4-ounce servings of fish each week. That's the conclusion of a study published in the Archives of Ophthalmology. Researchers found that people who ate a diet rich in omega-3 fatty acids were nearly 40% less likely to develop age-related macular degeneration than those who ate little of those heart-healthy fats.

Omega-3 fatty acids are commonly found in mackerel, tuna, salmon, and other oily fish. Macular degeneration is a common cause of blindness in older people. The healthy fats are believed to prevent the disease by promoting healthy blood vessel function, influencing which genes turn on and off, and reducing inflammation.

To read an article from WebMD posted on the CBS News web site go to: Eating Fish May Preserve Eyesight