Vision with macular degeneration
As macular degeneration develops, clear, normal vision (shown left) becomes impaired by a general haziness. With advanced macular degeneration, a blind spot typically forms at the center of your visual field (shown right).
Dry macular degeneration is a common eye disorder among people over 50. It causes blurred or reduced central vision, due to thinning of the macula (MAK-u-luh). The macula is the part of the retina responsible for clear vision in your direct line of sight.
Dry macular degeneration may first develop in one or both eyes and then affect both eyes. Over time, your vision may worsen and affect your ability to do things, such as read, drive and recognize faces. But this doesn't mean you'll lose all of your sight. Vision loss is typically central and people retain their peripheral vision. Some people have only mild central vision loss, while in others it can be more severe.
Early detection and self-care measures may delay vision loss due to dry macular degeneration.
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Dry macular degeneration symptoms usually develop gradually and without pain. They may include:
- Visual distortions, such as straight lines seeming bent
- Reduced central vision in one or both eyes
- The need for brighter light when reading or doing close-up work
- Increased difficulty adapting to low light levels, such as when entering a dimly lit restaurant
- Increased blurriness of printed words
- Decreased intensity or brightness of colors
- Difficulty recognizing faces
- A well-defined blurry spot or blind spot in your field of vision
Dry macular degeneration can affect one or both eyes. If only one eye is affected, you may not notice any changes in your vision because your good eye may compensate for the weak eye. And the condition doesn't affect side (peripheral) vision, so it rarely causes total blindness.
Dry macular degeneration is one of two types of age-related macular degeneration. It can progress to wet (neovascular) macular degeneration, which is characterized by blood vessels that grow under the retina and leak. The dry type is more common, but it usually progresses slowly (over years). The wet type is more likely to cause a relatively sudden change in vision resulting in serious vision loss.
When to see a doctor
See your eye doctor if:
- You notice changes in your central vision
- Your ability to see colors and fine detail becomes impaired
These changes may be the first indication of macular degeneration, particularly if you're over age 60.
Parts of the eye
Located at the back of your eye in the center of your retina, a healthy macula allows for normal central vision acuity. The macula is made up of densely packed light-sensitive cells called cones and rods. Cones are responsible for color vision, and rods enable you to see shades of gray.
No one knows exactly what causes dry macular degeneration. But research indicates it may be affected by a combination of heredity and environmental factors, including smoking, obesity and diet.
The condition develops as the eye ages. Dry macular degeneration affects the macula — an area of the retina that's responsible for clear vision in your direct line of sight. Over time, tissue in your macula may thin and lose cells responsible for vision.
Factors that may increase your risk of macular degeneration include:
- Age. This disease is most common in people over 60.
- Family history and genetics. This disease has a hereditary component. Researchers have identified several genes that are related to developing the condition.
- Race. Macular degeneration is more common in Caucasians.
- Smoking. Smoking cigarettes or being regularly exposed to smoke significantly increases your risk of macular degeneration.
- Obesity. Research indicates that being obese may increase your chance that early or intermediate macular degeneration will progress to the more severe form of the disease.
- Cardiovascular disease. If you have had diseases that affected your heart and blood vessels, you may be at higher risk of macular degeneration.
People whose dry macular degeneration has progressed to central vision loss have a higher risk of depression and social isolation. With profound loss of vision, people may see visual hallucinations (Charles Bonnet syndrome). And dry macular degeneration may progress to wet macular degeneration, which can cause rapid vision loss if left untreated.
It's important to have routine eye exams to identify early signs of macular degeneration. The following measures may help reduce your risk of developing dry macular degeneration:
- Manage your other medical conditions. For example, if you have cardiovascular disease or high blood pressure, take your medication and follow your doctor's instructions for controlling the condition.
- Don't smoke. Smokers are more likely to develop macular degeneration than are nonsmokers. Ask your doctor for help to stop smoking.
- Maintain a healthy weight and exercise regularly. If you need to lose weight, reduce the number of calories you eat and increase the amount of exercise you get each day.
- Choose a diet rich in fruits and vegetables. Choose a healthy diet that's full of a variety of fruits and vegetables. These foods contain antioxidant vitamins that reduce your risk of developing macular degeneration.
- Include fish in your diet. Omega-3 fatty acids, which are found in fish, may reduce the risk of macular degeneration. Nuts, such as walnuts, also contain omega-3 fatty acids.