The Human eye by: Hal H.

The Parts

Pupil: The opening of the iris. The pupil may appear to open (dilate) and close. It is the iris that is the prime mover; the pupil is merely the absence of iris. The pupil determines how much light is let into the eye

Iris: a flat, colored, ring-shaped membrane behind the cornea of the eye.

Sclera: the white outer layer of the eyeball.

Optic Nerve: Each of the second pair of cranial nerves, transmitting impulses to the brain from the retina at the back of the eye.

Retina: The retina is the nerve layer that lines the back of the eye, senses light, and creates impulses that travel through the optic nerve to the brain

Rods and Cones are responsible for vision at low light levels (scotopic vision). They do not mediate color vision, and have a low spatial acuity. In the top figure, you can relate visual angle to the position on the retina in the eye.

Aqueous Humor: The clear fluid filling the space in the front of the eyeball between the lens and the cornea.

Vitreous Humor: The transparent jellylike tissue filling the eyeball behind the lens.

Ciliary Muscle: The part of the eye that connects the iris to the choroid. It consists of the ciliary muscle (which alters the curvature of the lens), a radial ciliary processes (from which the lens is suspended by ligaments), and the ciliary ring which adjoins the choroid)


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