Kabbalah su Genesi 49:23

One who guards his vision connects with Chesed, since the lion (Aryeh) is on the right side, as it says in the Tikkunei Zohar, and it is hinted in “they four had the face of a lion on the right side” (Ezekiel 1:10), and Aryeh is the same letters as Re’iyah (vision). Since Abraham the Patriarch always had his intention to connect to the Right side, he said “thus, now I know you are a beautiful woman” (Genesis 12:11), and the Sages explain that he saw her face in water. All the aspects of correcting the eyes that we explained above correct the Brit as well, because Yosef is attached to the eye, as it says “Joseph is a fruitful bough, A fruitful bough by a spring [Ayin]” (Genesis 49:23), and he is also attached to the analysis of the eye, as is explained in its place. And specifically because the sperm is the light of man’s vision, and since he damages his sperm, a tear drop falls from his eye and the tear drop lessens the sperm, as is explained in tractate Gitin that the tear drop is also the light of the eyes.