John Calvin on Genesis 46:4

4. And Joseph shall put his hand upon thine eyes. This clause was added for the sake of showing greater indulgence. For though Jacob, in desiring that, when he died, his eyes should be closed by the hand of Joseph, showed that some infirmity of the flesh was involved in the wish; yet God is willing to comply with it, for the sake of moderating the grief of a fresh banishment. Moreover, we know that the custom of closing the eyes was of the greatest antiquity; and that this office was discharged by one most closely connected with the deceased either by blood or affection.