There is not really that much, but we have links to what there is.
If you go to the disABILITIES FAQs thread near the top of the thread list on this board, you will find some helpful links in post #3 of that thread. (Look for the green arrow in one of the left side columns, or there is a link to that thread in my signature).
One of the links at the top of post #3 of that thread goes to the Disney website's page about services they have for people with visual impairments. There are also links to the WDW Guidebooks for Guests with Disabilities for each park.
Also in post #3, there are some links to some helpful past threads further down. One of the threads is about planning for a trip for a visually impaired 4 yr old, but has some information that would be helpful even for an older person. Another thread that may be helpful is about boarding rides (specifically those with moving walkways).