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How much has his vision been affected already?
Please allow me to tell you a bit about macular degeneration.
There are two types of macular degeneration: the dry and the wet. The dry type is characterized by what we call drusen- white accumulations of extracellular material in a layer of the retina. The wet is when these drusens cause the layer under the retina, to grow new vessels and bleed.
In some cases, AMD advances so slowly that people notice little change in their vision.It is very difficult to predict if or when one will lose vision because of AMD.
Regular comprehensive eye exams can detect macular degeneration before the disease causes vision loss. So I recommend you keep up with your father's appointments and perhaps ask his ophthalmologist if he recommends the AREDS vitamins. These vitamins have been found to help a CERTAIN group of people with AMD.
Vitamin A has something called beta carotene in it. This has been found to be linked to lung cancer in patients whom are smokers. Smoker should not take vitamin A.
You father must either be a current smoker or had been in the past.