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 husband are causing problems to her domestic bliss. This story leads directly into the audio drama "The Bride of Peladon". The hallucinogenic plants in this story reappear in "Brotherhood of the Daleks". Mission of the Viyrans is a Big Finish Productions audio drama based on the long-running British science fiction television series "Doctor Who". It is a one-part story written by Nicholas Briggs and was released alongside a three-part story, "The Mind's Eye". The Doctor and Peri encounter the time travelling Viyrans on a holiday planet. "Mission of the Viyrans" completes the "Virus Strand" story arc, which also includes the