1. Aim: Students will be able to understand the structure and function of the eye
Do Now: Take out your homework to submit (sensation and perception packet), then copy down and answer the following multiple choice question
The function of the lens is to
Project an image onto the cornea
Focus an image on the retina
Locate an image
Contain receptor cells that are sensitive to light
Locate the blind spot
Homework:
States of Consciousness Homework due on Monday, November 30 (please don’t procrastinate)
Exam on Friday, December 4

2. Vision Our most dominating sense.
Aim: Students will be able to understand the structure and function of the eye
Vision
Our most dominating sense.
How vision works
Light enters through corneapasses through the pupillens focuses incoming rays into image on retina (accommodation: eyes lens changes shape to focus)rods and conesbipolar cells (sensory neuron with two extensions)ganglion cells (axons form the optic nerve)optic nerve carries information to the brain

3. Phase One: Gathering Light
Aim: Students will be able to understand the structure and function of the eye
Short wavelength=high frequency
(bluish colors, high-pitched sounds)
Long wavelength=low frequency
(reddish colors, low-pitched sounds)
Great amplitude
(bright colors, loud sounds)
Small amplitude
(dull colors, soft sounds)
Phase One: Gathering Light
The height of a wave gives us its intensity (brightness).
The length of the wave gives us its hue (color).
ROY G BIV

4. Retina’s Reaction to Light- Receptors
Aim: Students will be able to understand the structure and function of the eye
Retina’s Reaction to Light- Receptors
Rods
detect black, white and gray
Cones
near center of retina
fine detail and color vision
daylight or well-lit conditions

5. Vision- Receptors Receptors in the Human Eye Cones Rods Number
Aim: Students will be able to understand the structure and function of the eye
Vision- Receptors
Receptors in the Human Eye
Cones
Rods
Number
Location in
retina
Sensitivity in
dim light
Color sensitive?
Yes
Low
Center
6 million No
High
Periphery
120 million

6. Normal Nearsighted Farsighted Vision Vision Vision
Aim: Students will be able to understand the structure and function of the eye
Acuity- the sharpness of vision (can be affected by distortions in the eye’s shape)
Nearsightedness- condition in which nearby objects are seen more clearly than distant objects
Farsightedness- condition in which faraway objects are seen more clearly than near objects
Normal Nearsighted Farsighted Vision Vision Vision

7. Visual Information Processing
Feature Detectors
Located in the visual cortex
nerve cells in the brain that respond to specific features
shape
angle
movement
We have specific cells that see the lines, motion, curves and other features of this turkey. These cells are called feature detectors.

8. Visual Information Processing
Aim: Students will be able to understand the structure and function of the eye
Visual Information Processing
Parallel Processing
processing of several aspects of a object simultaneously

9. Distribution of rods and cones
This demonstrate provides an illustration of the distribution of rods and cones in the retina, as well as of the differing ability of these photoreceptors to detect color. More specifically, it demonstrates that stimuli in the center of the visual field are detected by color sensitive cones concentrated in the fovea, while stimuli on the edges of the visual field are detected in the periphery of the retina by rods, which are not sensitive to color

10. Process
Student will sit at the front of the room facing the class, and focus their eyes ONLY on a spot or object at the back of the room
If the subject’s eyes stray away from the fixation point, the demonstration will probably not work very well
With the subject’s eyes fixated, stand directly to the subject’s left and hold a colored marker/pen about four feet away from their left ear, at about their eye level (Do not allow the subject to see ahead of time what you are holding)

11. Tell the subject you are holding something in your hand and ask them what it is and what color it is
Then move forward a foot or so and ask the same question
Continue to ask these questions each time you move, one foot at a time, in an arc that would eventually place the object in front of the subject