Human eye of the size of the pupil, regulation and suppression of the hormone melatonin and entrainment of the body clock. The eye is not shaped like a perfect sphere, rather it is a fused two-piece unit, composed of the anterior segment and the posterior segment. The anterior segment is made up of the cornea, iris and lens. The cornea is transparent and more curved, and is linked to the larger posterior segment, composed of the vitreous, retina, choroid and the outer white shell called the sclera. The cornea is typically about 11.5 mm (0.3 in) in diameter, and 1/2 mm (500
Catholic theology of the body the consequence according to Didymus. He compares this with wine being mixed with water. The body has some functions for the soul. The body informs the soul of the sensual world around them. Didymus called the body the outer person and the soul the inner person. The outer person is perishable. The inner person is eternal. The heart of the person leads the person as a whole towards good or bad deeds. Didymus maintains freedom of will, which is however weakened through the fall of Adam of Eve. A person who uses his free will to be a spiritual person,