Is it fast to lose your vision due to old-age macular degeneration?

Depends: Approximately 90% of people only have the dry form of age-related macular degeneration where the vision loss is slower and usually less significant. However, approximately 10% of people have the wet form where bleeding, swelling, and scarring cause more rapid and more drastic vision loss. There is no treatment that has been shown to be effective for the dry form, but the wet form can be controlled.

Possibly: "wet" macular degeneration, caused by a leaking blood vessel, can cause vision to deteriorate quickly. If found early, treatment now exists to limit the loss of vision in most cases. "dry" macular degeneration typically occurs much more slowly but may, in the long run, be just as bad.