1. © Richard Goldman October 9, 2006
Module 9 Vision: Shedding Light on the Eye Chapter 3, Pages Essentials of Understanding Psychology- Sixth Edition PSY110 Psychology
© Richard Goldman
October 9, 2006

2. Electromagnetic Spectrum

3. Visible Light

4. Structure of the Eye
Sclera – white outer structure that forms the body of the eye
Cornea – Clear outer structure that collects light
Lens – Clear inner structure that focuses light onto the retina
Iris – Colored structure that controls the amount of light entering the eye
Pupil – The orifice in the enter of the iris that light passes through
Retina – Structure made up of light sensitive cells that line the back of the eye
Optic Nerve – Bundle of nerves transmitting information from the eye to the brain

5. Structure of the Retina
Rods – Highly sensitive light sensitive nerve cells
Cone – Color sensitive nerve cells
Bipolar Cells – Nerve cells that receive input from the rods and cones
Fovea – Area of retina with high concentration of rods and cones – allows sharp detail vision
Blind Spot – Place where the optic nerves passes through the retina

8. Visual Processing Images are inverted and reversed
Visual processing starts in the retina
Optic Chiasm – Left-right split of image from each eye – left to left brain, right to right brain

9. Color Vision & Color Blindness
Humans can see about 7 million different colors
Color Blindness: 1 in 50 men, 1 in 5,000 women
Trichromatic color vision – Three different types of cones are sensitive to three different colors
Opponent-process color vision – Higher level processing compares input from paired receptors in the eye to determine color information.Interactivity 9-1 (Show for Review)