Oliver Sachs detailed the experience of at least one blind person whose sight was restored in one of his books. It was not an unqualified success. I recall Sachs description of the man's attempt to 'see' his dog. He had always 'felt' his dog which is a sequential experience. He was unable to comprehend the dog with sight since it required a unified interpretation of his experience in one moment. He found adapting to the world of sight extremely difficult. I think the person ended up regretting his newfound sight.
60 Minutes did a piece on someone who had had his sight restored a few weeks ago. It takes some serious determination to regain sight as an adult.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13