The macular of your eye is used to see fine detail. AMD (Age-related Macular Degeneration) occurs with aging when sharp, central vision is gradually destroyed. Central vision is needed for daily activities like reading and driving. AMD is the leading cause of vision loss in Americas 60 years old or older.
AMD is painless. Sometimes the progression of AMD isn’t even noticed by people when it is changing their vision. In other cases the progression is much faster and could lead to blindness in both eyes.
This is an example of what AMD can look like.
Taken from Action For Blind People