learning goal 3.3: describe how different parts of the eye and brain coordinate in the vision...
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
signalsFovea
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