Lhe eyes of man were made in the likeness of the firmament. In fact, the pupil of the eye bears a resemblance to the sun; the black or gray color which is around the pupil bears a resemblance to the moon, and the white which is outside, to the clouds. The eye is made of fire and water. It is the fire which gives it consistency and strength to exist; water gives him the ability to see.
If the blood is found in excess on the human eye, it prevents this eye from seeing because it dries up the water which allows vision; and if the blood is there in too small a quantity, the water which should have given man the power to see no longer has this faculty, because what should support the blood, like a pillar, makes him then default.