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
The Eye of the Sibyl his "Exegesis", and later the novels "VALIS", the posthumously published precursor to VALIS, "Radio Free Albemuth", and "The Divine Invasion". Eventually rejected by the venue for which it was written, the major points of Dick's 1975 worldview are set forth, in a style reminiscent of his earlier work, and very similar to his treatment of this material in his later books. The Eye of the Sibyl "The Eye of the Sibyl" is a science fiction short story by American writer Philip K. Dick. It was written sometime around 1975, but not published until 1987 when it was included in volume