What a strange thing... I was asking it myself yesterday evening!
I found this first hand report with LSD:
http://www.rollitup.org/...ns-ask-me-anythi.401212/Concerning scientific papers, nothing really up to date:
The effects of hallucinogens on blind monkeys.
Siegel RK, Brewster JM, Johnson CA, Jarvik ME.
Int Pharmacopsychiatry. 1976;11(3):150-6.
Effects of a Hallucinogenic Agent in Totally Blind Subjects
ALEX E. KRILL, M.D.; HUBERT J. ALPERT, A.B.; ADRIAN M. OSTFELD, M.D.
Arch Ophthalmol. 1963;69(2):180-185. doi:10.1001/archopht.1963.00960040186009.
I found nothing concerning DMT or Ayahuasca and blind people but would be very interested to read someone about this subject, given the rich visual experience induced by DMT.