Brother, yes the prisoners are human too but they are/were afterall wrongdoers for which reason they are in this state(except of course those wrongly imprisoned innocents).
As a woman who wants for my sisters what I want for myself, I wouldn't like that any innocent lady, blind or not, be given in marriage to a criminal simply because men of better standing in life refuse to marry them. That's very sad.
Of course supposing these prisoners have since repented and reformed, then I too see no issue in them marrying righteous women. Because after all who among us is without sin,sah?