Eye Anatomy Human eye ball is about 1 inch in diameter.

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Presentation transcript:

Eye Anatomy Human eye ball is about 1 inch in diameter.

Eye Parts Cornea: Transparent, dome shaped; covers iris & pupil Refractive (bends light); very sensitive. Should be smooth Astigmatism if not smooth Light goes through the cornea first

Eye Parts Iris: Colored part of eye surrounding pupil A muscle that can shrink or grow depending on the amount of light present

Eye Parts Pupil: The space in the center of the iris Just a space—shrinks or grows depending on the muscles of the iris Looks like a black dot Indicates amount of light present Indicates health

Eye Parts Lens: Transparent Refracts (bends light) Can change shape to focus (muscles on top and bottom) Can be replaced with a working lens if diseased

Eye Parts Retina: Takes up 2/3 of the inside back surface of the eye ball Contains rod and cone nerve cells - Rods help see light and dark - Cones help see colors Image falls on retina (inverted and smaller) Tears (rips) can be fixed with lasers

Eye Parts Optic Nerve: Connects the eye to the brain Blind spot is place where optic nerve is connected to the eye ball.

Try these Blind spot Light bulb Optical illusions http://www.exploratorium.edu/learning_studio/cow_eye/step01.html

Common vision problems Nearsightedness (myopia): This problem is often discovered in school-age children who report having trouble seeing the board. Near-sightedness usually becomes progressively worse through adolescence and stabilizes in early adulthood. It is an inherited problem.

Nearsightedness

How to correct nearsightedness If the image needs to be stretched out to reach the correct point on the retina, which kind of lens is needed to correct this?

Common vision problems Farsightedness (hyperopia) : This vision problem occurs when light rays entering the eye focus behind the retina, rather than directly on it. The eyeball of a farsighted person is shorter than normal. Many children are born with hyperopia, and some of them "outgrow" it as the eyeball lengthens with normal growth.

Farsightedness People who are farsighted have need to move printed matter farther from them in order to focus it. Usually occurs in middle age ~ age 40.

How to correct hyperopia If the image needs to be shrunk to reach the correct point on the retina, which kind of lens is needed to correct this?