Mishná sobre Negaim 4:15

A priest who is blind in one eye or the light of whose eyes is dim should not inspect negaim; for it says, "Wherever the priest's eyes can see" (Leviticus 13:12). In a dark house one may not open up windows in order to inspect his nega.

What is [the posture] of examining negaim? A man is inspected in the posture of one that hoes or one that gathers olives. And a woman [is inspected in the posture] of one who is arranging dough and one who nurses her child, and one that weaves at an upright loom if the nega was in the right armpit. Rabbi Judah says: also in the posture of one that spins flax if it was within the left armpit. Just as [is the posture] for examining for the nega, so too [is the posture] for shaving hair.