SPANGLER SCIENCE

Sensory System - Eye Notes

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Function: Receptors to collect images by using light to convert into electrical impulses for the brain to interpret.

*A sensory organ

*Vision is response to light

*Part of the Nervous system.


Parts: 

EYE: organ for vision

-receptors detect “visible light”

CORNEA- outermost pat of the eye. 

-clear, fluid-filled membrane.

-protection.

-allows light in.

PUPIL- opening where light enters.

-changes size with the amount of light.

pupil size increases when light is dim.

pupil size decreases when light is bright.

IRIS- surrounds pupil

-control amount of light into the pupil.

-muscle fibers change size of the pupil.

LENS- where light hits after entering the pupil.

-bends light rays and puts the image upside down and reverse.

-convex lens (curved), thick in the middle and thin on the outside.

-brings image into focal point by parallel lines.

- magnifies object.

-similar to microscope, magnifying glass, & telescope.

-changes direction of light to the retina.

-changes shape to adjust focus. close-curved/far-flat.

RETINA- where light is sent to the back of the eye.

-changes light into electrical impulses for the brain to interpret.

by photoreceptor nerve cells.

a)rods- dim light receptors.   GRAYS

b)cones- bright light receptors.  COLORS

OPTIC NERVE- nerve that sends infor to the brain.

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W.T. Eich Intermediate