Right this is what I think, it may not be 100% true but I think you’d have to ask a visually impaired person to find the through answer. I do wear glasses sometimes but that doesn’t count 😀
I think if you were born blind you only dream using the senses you’ve always had, so I guess you could say they have ‘sound’ dreams but i wouldn’t be surprised if they also have tactile dreams! And i imagine if you ask a blind person to draw their dreams, i imagine they’d be able to draw shapes that they dream too!
Another good an interesting question! What I have discovered is that people who are born blind probably don’t dream in pictures. What they say is they dream in sound and “emotion” which I suppose makes sense really. I found a quote from a blind person which said “I don’t “see” in dreams because I have no visual images on which to base anything” which I think makes sense. I think this is a difficult question to answer because only you know what is in your dreams.
Hope that helps