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 Heron context of her development as a writer: "The Eye of the Heron" contains the phrase: "A beginning place". Le Guin reused this phrase in the title of her 1980 novel "The Beginning Place". The Eye of the Heron The Eye of the Heron is a 1978 science fiction novel by American author Ursula K. Le Guin which was first published in the science fiction anthology "Millennial Women". "The Eye of the Heron" is a science fiction novel set on the fictional planet of Victoria in a speculative future, probably sometime in the 22nd century, when the planet has been colonized