Adam Clarke on Genesis 19:11

And they smote the men - with blindness - This has been understood two ways:

1. The angels, by the power which God had given them, deprived these wicked men of a proper and regular use of their sight, so as either totally to deprive them of it, or render it so confused that they could no longer distinguish objects; or,

2. They caused such a deep darkness to take place, that they could not find Lot's door. The author of the book of The Wisdom of Solomon was evidently of this latter opinion, for he says they were compassed about with horrible great darkness, Gen 19:17. See a similar case of Elisha and the Syrians, 2Kgs 6:18, etc.