Or HaChaim on Genesis 48:10/אור החיים על בראשית מ״ח:י׳

1 ועיני ישראל כבדו מזקן, Israel's eyes were heavy with old age, etc. Why did the Torah choose this point to inform us of Jacob's failing eyesight? What does it have to do with his proceeding to embrace and kiss Joseph's children? Besides, why did the Torah have to describe these kisses as להם instead of אותם? Perhaps one of these details will help us understand the other detail. Jacob embraced the children in the wrong places and kissed them in the wrong places due to his failing eyesight. If that were true the expression להם instead of אותם is quite understandable.