LEARNING GOAL 3.3: DESCRIBE HOW DIFFERENT PARTS OF THE EYE AND BRAIN COORDINATE IN THE VISION PROCESS. Vision.

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Presentation transcript:

LEARNING GOAL 3.3: DESCRIBE HOW DIFFERENT PARTS OF THE EYE AND BRAIN COORDINATE IN THE VISION PROCESS. Vision

Just FYI… In this lesson and the next, I’m going to give you lots of extra info that you WON’T be tested on – some will help you with your trial, and some is just plain interesting… The slides with RED titles are fair game for the test; the other slides are just for your benefit

Stations Review What happened to your pupils when the level of light changed? (station #5) How readily were you able to detect color in your peripheral vision? (station #6)

Sight – The Basics Depends on light waves bouncing off the object The length of the wave determines the color we see The height of the wave determines how bright the image appears

Sight – The Eye

Sight – The Front of the Eye Cornea  Clear, curved structure that starts to focus light Pupil  Opening that allows light to pass into the eye Iris  Muscle that dilates/contracts (opens/closes) the pupil, controlling the amount of light that can get in Lens  Focuses light to project the image onto the back of the eye

Sight – The Back of the Eye Retina  Light-sensitive surface on the back of the eyeball Rods and Cones  Receptor cells that detect light and generate neural signals Fovea  Point with the most rods/cones; where your vision is best Optic nerve  Fibers that carry signals from the eyes to the thalamus Blind spot  Region of the retina where the optic nerve connects and there are no rods/cones to detect light

Sight – Nearsightedness and Farsightedness Nearsightedness: distant images are projected to a point in front of the retina Farsightedness: nearby images are projected to a point behind the retina

Near and Far Sightedness

Stations Review When you stared at certain colors for a long time, then looked at a blank paper, what happened? (station #8)

Sight – Seeing in Color Rods and cones  Rods can detect even low levels of light (throughout retina)  Cones detect different colors and details (mostly in center) Trichromatic (three-color) theory  All colors are a combination of red, green, and/or blue light  Cones can be classified as red, green, or blue Opponent-process theory  Colors are detected in opponent pairs: red/green, blue/yellow, black/white  Stimulating the nerve associated with one color will inhibit the nerve associated with the opposite color

Color in Peripheral Vision