Do Blind People Have Images in Their Dreams?

Several scientific sleep laboratory studies have shown that dreamers who were born blind and those who became blind in infancy do not have visual imagery in their dreams, whereas those blinded in adolescence or young adulthood often retain visual mental imagery in their waking life and in their dreams.

These controlled experiments confirm what has been reported in a number of earlier self-report studies reviewed by Kirtley (1975), who concluded that individuals blinded before the age of about 5 report no visual imagery in dreams as adults, whereas those blinded after about the age of 7 are likely to retain visual imagery in dreaming.

Source: http://psychology.ucsc.edu/dreams/Library/kerr_2004.html