The Human Eye

Topics: Eye, Presbyopia, Myopia Pages: 3 (1236 words) Published: December 7, 2014
The human eye is the organ which gives us the sense of light allowing us to learn more about the surrounding world than any of the other five senses. We use our eyes in almost everything we do whether reading,working watching television ,writing a letter driving a car and countless other activities The eye allows us to see and interpret the shapes, colors, and dimensions of objects in the world by processing the light they reflect of give off.

Aqueous humor
clear watery fluid found in the anterior chamber of the eye; maintains pressure and nourishes the cornea and lens Vitreous humor
clear, jelly-like fluid found in the back portion of the eye: maintains shape of the eye and attaches to the retina Blind spot
small area of the retina where the optic nerve leaves the eye: any image falling here will not be seen Ciliary muscles
involuntary muscles that change the lens shape to allow focusing images of objects at different distances Cornea
transparent tissue covering the front of the eye: does not have blood vessels; does have nerves Cones
photoreceptors responsive to color and in bright conditions; used for fine detail Rods
photoreceptors responsive in low light conditions; not useful for fine detail Fovea
central part of the macula that provides sharpest vision; contains only cones Iris
circular band of muscles that controls the size of the pupil. The pigmentation of the iris gives "color" to the eye. Blue eyes have the least amount of pigment; brown eyes have the most Lens
transparent tissue that bends light passing through the eye: to focus light, the lens can change shape Macula
small central area of the retina that provides vision for fine work and reading Optic nerve
bundle of over one million axons from ganglion cells that carry visual signals from the eye to the brain Pupil
hole in the center of the eye where light passes through
Choroid
Thin tissue layer containing blood vessels, sandwiched between the sclera...
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