This depends on when someone became blind. People who were born blind and have never experienced visual imagery in life, usually have no visual images in their dreams. People who became blind before the age of 5 hardly experience visual imagery in their dreams. People who became blind between 5 years and 7 years usually retain visual imagery and often experience it in their dreams. Most people who become blind after 7 years of age experience visual imagery in their dreams but the frequency and clarity of the imagery reduces with time.
Sleeping has everything to do with your brain as if they were hallucinations/ day dreaming. Seeing with your EYES has to do with you occipital part of the brain. So I would think that yes they would be able to see their dreams
If they are born blind.. I think they are able to see in their dream. Or at least picture. Because from age 0 till you grow old, you can feel things, hear stories, smell, sense, feel and a lot. When they close their eyes, they probably imagine it.
If they have been blind since birth then no they could not see anything in dreams. They would have had to "see" it before to have that image to go by. If they didnt go blind till later in life then yes you can see things in your dreams because you have the memorie of all the things you used to be able to see.