Sefer ha Brit, Shemirat Eynaim
Our Master the Chatam Sofer wrote in The introduction to Parashat Bereshit the following: Our Sages, z'l said (Avodah Zara 20): "The angel of death is full of eyes and when the time for a person to die comes, the angel stands above his head, with his sword ready and a bitter drop hangs from the sword, when the sick person sees him, he shakes and opens his mouth and the drop enters the mouth, from it he dies, he rots and his face turns green" And this is difficult: "Why is he full of eyes? The Gaon Rabbi Natan Adler, zt'l said that when a person transgresses, G-d forbid, the prohibition of not going astray after one's eyes, and savors the taste of looking at forbidden places, with this transgression he gives eyes to the Yetzer ha Ra, who is none other than the angel of death, and from this he is full of eyes, from those same eyes that looked at places that were forbidden for him to look at, and from this the person shakes when he realizes that he is the one who, by looking at forbidden things, caused the angel of death to have so many eyes. And also Rabbi Yehonathan Eybeshutz zt'l and the Chidda wrote thus.