ויהי כי זקן יצחק ותכהין עיניו מראות
Rashi explains that Yitzchak Avinu’s premature vision loss was due to the smoke that Eisav’s wives raised when they burned incense for their idols. Alternatively, when he was bound upon the Altar of the Akeidah, as Avraham Avinu was about to slaughter him, the Heavens opened up and the Ministering Angels saw what was happening to him. They began to cry, their tears descending and falling on Yitzchak’s eyes, causing them to dim later in life. In his hesped, eulogy, for his son, who had died an untimely death, Horav Shmuel Birnbaum, zl, asked why was it necessary for the…