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They just have nothing sending electrical impulses with visual information to the brain.

Therefore, people who are blind since birth still technically have the ability to experience visual sensations in the brain. the ability of the brain to rewire itself). In the few cases where blindness results from problems in the brain, the person usually regains some amount of vision due to brain plasticity (i.e. In the vast majority of cases, blindness results from problems in the eyes and in the optic nerves, and not in the brain. If any one of these three steps is significantly impaired, blindness results. The human experience of vision involves three steps: (1) the transformation of a pattern of light to electrical impulses in the eyes, (2) the transmission of these electrical impulses from the eyes to the brain along the optic nerves, and (3) the decoding and assembly of these electrical impulses into visual sensations experienced in the brain. What is more surprising is the discovery that people who were born blind also dream in visual images. For this reason, he can dream in visual images. 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. Dreams are drawn from memories that are stored in the brain as well as from brain circuitry that is developed while experiencing the outside world.

For people who were born with eyesight and then later went blind, it is not surprising that they experience visual sensations while dreaming. Yes, blind people do indeed dream in visual images.