John Gill

They say unto him, Lord, that our eyes may be opened. That is, that their sight might be restored to them; for being deprived of that, it was all one as if their eyes were so closed, that they could not open them; and so the recovery of it is expressed by an opening of them. The opening of the eyes of the blind was prophesied of, as what should be done in the days of the Messiah, and by him, as an evidence of his being that person, Isa 35:5 which prophecy these blind men might be acquainted with, and be an encouragement to their faith to expect a cure from him. They do not ask for alms, but for the recovery of their sight; which being granted, they would be able to get their bread in another way; for they were not like some idle persons that choose rather to be under such a calamity, or any other, that they might not be obliged to work with their hands for a livelihood. Their request shows, that they made no doubt of it, but firmly believed that Christ was able to do this for them, though the thing was impossible to be done by man; who therefore must conclude that he was not a mere man, but the Son of the living God. Matthew 20:34