Keep it short and conscise. I want to be specific and direct.
Dreams are developed from memories that are stored in the brain as well as from brain circuitry that is developed while experiencing the outside world. Therefore, even though a person who lost his vision may be currently blind, his brain is still able to draw on the visual memories and on the related brain circuits that were formed before he went blind. For this reason, he can dream in visual images. What is more surprising is the discovery that people who were born blind also dream in visual images.
Yes, blind people has also dreams in visual images. For people who are born with eyesight and then later went blind, it is not new anymore that they feel some visual sensations while dreaming