John Calvin on Acts 9:8

8. He was raised up from the earth. Luke addeth now, that he was taken with so great fear that he could not rise of himself; and not that only, but he was also blind for a time, that he might forget his former wit and wiliness. “Acumen,” acumen. When as he saith, that after that his eyes were opened, he saw not, it seemeth that it doth not agree with the other words which shall follow by and by, that his eyes were covered, as it were, with scales; but the meaning of this place is, that he was blind indeed, and deprived of his sight for that three days; because when he opened his eyes he saw nothing.