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 communicate with him. The human body is the lower element of the human person. Through the body, man experiences his temporal existence. But Gregory also admired human beauty and the bodily abilities to dream, sleep and memorize. The body can be both a friend and enemy of a person, according to Gregory. The final goal is a unity of the soul with God, which is possible with Grace and the assistance of the Holy Spirit according to Gregory. Gregory of Nyssa (335-394) was a bishop who wrote, among others, about the creation of the human body. Unlike Irenaeus, Gregory states,