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 Mind's Eye & Mission of the Viyrans The Mind's Eye & Mission of the Viyrans The Mind's Eye is a Big Finish Productions audio drama based on the long-running British science fiction television series "Doctor Who". It is a three-part story written by Colin Brake and was released alongside a one-part story, "Mission of the Viyrans". The Doctor, Erimem and Peri have gone their separate ways. The Doctor is wandering on a nameless paradise planet filled with murderous primates (but only at night) and carnivorous plants. Erimem is the Queen of a space colony empire, New Cairo, and is suffering a rebellion, while Peri's stepson and new