ועשו להם ציצית על כנפי בגדיהם לדרתם...וראיתם אתו וזכרתם את כל מצות ד'
The Eliyahu Rabbah (Ohr HaChaim 24:3) quotes, “It is found in the Rishonim that, whoever passes the Tzitzis over his eyes during the recital of Krias Shema, is ensured that he will not become blind. Horav Yitzchak Zilberstein, Shlita, writes that he was questioned by an ophthalmologist concerning this segulah, talisman, that protects from blindness. How does it work? What reason is there? Rav Zilberstein explained, quoting the Chida, who explains why Egypt was struck with the plague of Choshech, darkness. The Egyptians “closed their eyes,” made themselves forget the good fortune which they experienced with the arrival of Yaakov…