He's trying to protect your eyes from the influence of your surroundings.

New eye drops have appeared on your nightstand. Notes in which an unknown person vividly and openly admires your eyes. Bright lamps have been replaced by dim ones, monitors have broken down. Those strange people on the street who were looking at you with dirty, lustful eyes—where are they now? A strange question. They no longer exist. Jack is simply trying to protect your beautiful eyes.

Warning! English is not my language, so there may be errors in the text. If you don't mind, please leave a review in the comments; I value your opinion of my work. And if I need any corrections, please let me know! Thanks in advance. :)