Rashi on Leviticus 13:12/רש"י על ויקרא י״ג:י״ב

1מראשו FROM THE HEAD of the man ועד רגליו AND UNTO HIS FEET,

2לכל מראה עיני הכהן WHERESOEVER THE PRIEST LOOKETH (lit., to the whole sight of the priest’s eyes) — This excludes a priest the sight of whose eyes is darkened (whose sight is imperfect) (Sifra, Tazria Parashat Nega'im, Chapter 4 4).