The Eye Chapter 3. The Eye The eye is made up of several important structures (they are so important that you will need to know them for your test). 

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Presentation transcript:

The Eye Chapter 3

The Eye The eye is made up of several important structures (they are so important that you will need to know them for your test).  Cornea  Pupil  Iris  Lens  Retina

Cornea Captures light Sensitive to touch, temperature and chemicals A touch causes an involuntary closing of the eyelid Possibly the creepiest picture ever taken

Pupil Opening for light waves to enter the eye (by product of the Iris) Appears black because the light is absorbed by tissues inside the eye Pupil

Iris Regulates the amount of light by controlling the size of the pupil Because it is a muscle, it can atrophy and wear out. The colored part of the eye Iris

Lens Focuses light, with the help of the iris, onto the retina. Changes shape to help focus on objects at various distances. Deals with nearsightedness and farsightedness.

Lens

The Retina A thin layer of nerve fibers lining the inner area of the eye (Like the film on a camera). If light entering the eye does not hit the retina, it will not be sensed. Too much retinal pressure (glaucoma) can lead to blindness or a blown out retina.

The Retina

Blind spots The hole in the back of the eye in which there are no cones or rods. The hole is called the optic disk. Each eye has one blind spot where the visual field is interrupted.

Blind spots Fortunately, your 2 eyes coordinate in such a way that they make up for the blind spot by working together. A person that loses an eye will have a blind spot to deal with.

Optic Nerve The pathway from the eye to the brain for neural impulses. Half of the fibers from each eye travel to each hemisphere of the brain. Each eye is controlled by both sides of the brain. This works to synchronize your eyes.

Optic Nerve