eye, organ of vision and light perception. In humans the eye is of the
camera type, with an iris diaphragm and variable focusing, or
accommodation.
In an alternate pathway to the one that transmits visual images, the
eye perceives sunlight. This information stimulates the hypothalamus,
which passes the information on to the pineal gland. The pineal gland
then regulates its production of the sleep-inducing chemical,
melatonin, essentially setting the body's circadian clock.
Oliver Ryan, mchaaban, bix2anca, and sherylga added this photo to their favorites.
* Sorin Arsu Photography * [deleted] 42 months ago | reply
Fine photo and description !