Somewhat related is the following quote from Couliano’s Eros and Magic in the Renaissance :
Ficino remains of the same opinion as Plato and Galen: in the act of seeing, “the internal fire” is externalized through the eyes, mixed with the pneumatic vapor and even with the thin blood that engendered spirit. That theory is confirmed by Aristotle himself, who relates that menstruating women who look look at themselves in the mirror leave little drops of blood on its surface. This can only mean that it is the thin blood brought to the eyes along with the pneuma.
See also this post on the existence of the evil eye in Mexican culture.