The Eye. The Pupil  A small adjustable opening.  Its size and the amount of light entering the eye is regulated by the iris.

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Presentation transcript:

The Eye

The Pupil  A small adjustable opening.  Its size and the amount of light entering the eye is regulated by the iris.

Iris  A ring of muscle tissue that forms the colored portion of the eye around the pupil.  Controls the size of the pupil opening.

Lens/Accommodation  The lens is the structure behind the pupil that changes the shape to help focus the images on the retina.  Accommodation is the process by which the eye’s lens changes shape to focus near or far objects on the retina.

Acuity  The sharpness of vision

Nearsightedness/Farsightedness  Nearsightedness is a condition where you see nearby objects more clearly than distant objects because distant objects focus in front of the retina  Farsightedness is a condition where you see far away objects more clearly than near objects because the image of near objects is focused behind the retina.

Retina  The Retina is the light-sensitive inner surface of the eye; it contains the receptor rods and cones plus layers of neurons that begin the processing of visual information.

Rods/Cones  Rods are Retinal receptors that detect white, black, and gray.  Cones are receptor cells that are concentrated near the center of the retina and that function in the daylight or in well- light conditions.

Optic Nerve Optic Nerve  The nerve that carries neural impulses from the eye to the brain.