Macular degeneration usually causes a central vision loss, not a corner or peripheral vision deficit. If this is because of macular degeneration I would expect that you would have more of a central vision problem.
Has your doctor mentioned anything about glaucoma? Glaucoma, as a rule, affects the peripheral vision and not the central vision until an advanced stage.
There are two types of macular degeneration: dry and wet. Most have the dry, only a small amount the wet form. For people that lose significant vision, most of them have the wet. The only thing that can be done for people who have wet macular degeneration (leaking and bleeding in the retina) is having medicine injected in the eye soon after the bleeding starts. If this leaking/bleeding is left for a few weeks, it can scar and the vision problems it causes become permanent.
If you have dry macular degeneration, then the only things to be done for this are taking macular degeneration vitamins on a daily basis, not smoking, eating a healthy diet and living a healthy lifestyle, and also monitoring your vision on a daily basis for vision changes that may signal a change from dry to wet macular degeneration.
Glaucoma, however, is a different story. For the majority of people, it is a very treatable disease. Usually drops are effective at lowering pressure and this is what treats glaucoma and ultimately stops vision loss.
Does that help answer your question?
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My opinion is solely informative and does not constitute an informed medical opinion or recommendation. For an informed medical opinion and/or recommendation you must see an eye doctor.