Has anyone ever made a garden/ landscape for those who have little or no vision? i got to thinking about this on my way home from a seminar about macular degeneration (the loss of central vision due to deteriotion of the macular/ back of the eye)?

I am running a garden for my mother's nursing home residents, and our group there are and have been considering plants for such visitors.
Big and bold plants, bright colours and textured choices, as well as bringing the plants to easy reach of residents. You have to choose plants that can take handling, and in the mixed-perception problems one encounters in a senior's home, including the dementia-plagued ones that often beat the crap out of specimens, or may eat the plants.
Mullein (verbascum) is the current favourite just starting to bloom now, in the flower category, and ruby-red leaf lettuce in the veggie division.

I know OG did an article about blind people gardening awhile back. It may be in the archives here.

Scented geraniums, lavender, curry plant (Helichrysum italiacum, not edible), lemon verbena, lemon balm, heliotrope, mints can all be handled and scent the air and fingers.

You could even incorporate sounds like fountains, birdbaths and birdfeeders so as to hear the flapping of wings and singing, hummingbird attractant plants and hummingbird feeders. This could help with orientation in the garden and developing skills that deal with relying on other senses besides sight.