Dry age-related macular degeneration involves slow degeneration of retinal cells and can convert to the wet form.

“in the dry form there's this slow degeneration but some percent of people with the dry form of macular degeneration will actually convert to What's called the wet form it's called wet because new blood vessels actually grow inappropriately under and even into the retina and new blood vessels unlike our mature blood vessels tend to be leaky and so that the fluid leaks out of those blood vessels gets into the rtina interferes with vision and that can lead to a much more acute loss of vision”