By: Stephanie M. Faura THE HUMAN EYE

This is how an eye looks like when your looking at a person This is the parts of the eye

The eye is used for many things. Many people don’t know the wonders of the eye or how facinating it really is. THE EYE

Light is a kind of energy Travels 186,000 miles per second The light that you see from the sun was light that the sun gave out 8 minutes ago When light travels between two places it travels in waves of energy Light (waves) behave in four ways reflection, refraction, diffraction, and interference Christiaan Huygens (1629–1695) said that light was waves Sir Isaac Newton (1642–1727) thought that light was a stream of particles LIGHT

These are Sun rays

The outer layer of the eye Clear and Transparent Provides about 70% of the eye's refractive power Contains no blood vessels, damaging the cornea can be very painful Has five layers: the epithelium, Bowman's membrane, the stroma, Descement's membrane, and endothelium CORNEA

The pupil is a hole in the center of the iris Where the lens is PUPIL

Transparent tissue The lens is behind the pupil Lens help to focus images on the retina Lens can change shape by bending to focus on light LENS

The iris is the colored part of the eye just behind the cornea Colors can vary between people What is really fascinating about the iris is that it is like a fingerprint The iris pattern is different for every person Not even twins have a same looking iris IRIS The iris

Gel-like substance Between the lens and the retina Also keeps the shape of the eye. VITREOUS HUMOR Vitreous Humor

Thin layer of tissue that contains nerve cells Cells are responsive to light In the back portion of the eye RETINA

They able to make you see black and white Don’t see color React to low light levels ROD CELLS

Used for seeing color in bright conditions CONE CELLS

Graduated potentials is a signal that passes threw the bipolar cell to get to the ganglion cells Bipolar cells are connected to horizontal cell BIPOLAR CELLS

Connected to the Bipolar cells GANGLION CELLS

Part of the neuron that transmits nervous impulses Thickness of axons varies Thick axons carry nerve impulses more quickly Covered with a thick layer of the cell's fatty membrane AXONS

Branch-like structures on neurons Detect chemical signals DENDRITES

Collects nerve impulses Carries them to the brain Interprets them as an image OPTIC NERVE

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