1. The Eye Function, Structure, Focus, Vision Correction

2. Stare at bird for 30 s and look to left—what color is the ghost image?

3. Cyan (blue light + green light) Your red cone receptors are fatigued, so you only perceive cyan.

4. The Eye and its Structure Focusing lenses (double convex lens system) –Cornea (convex lens)--main focusing, fixed –Lens (convex lens)—fine focusing, adjusts Pupil (light regulator) Retina (back of eye) –Rod cells (senses intensity) –Cone cells (red, green and blue light receptors)

5. Rods and Cones in the Retina Retina (back of eye) –Rod cells (senses intensity) –Cone cells (red, green and blue light receptors

6. Rods and Cones http://www.accessexcellence.org/AE/AEC/ CC/vision_background.htmlhttp://www.accessexcellence.org/AE/AEC/ CC/vision_background.html http://webvision.med.utah.edu/photo1.html <> <> <> <>

7. Colorblindness Colorblindness is a deficiency in the number of red, green or blue cones (too few of one or more cone types). Normal vision Colorblindness http://www.toledo-bend.com/colorblind/aboutCB.html

10. Better Eyes http://micro.magnet.fsu.edu/primer/java/hu manvision/accommodation/index.htmlhttp://micro.magnet.fsu.edu/primer/java/hu manvision/accommodation/index.html

11. Rods and Cones http://users.rcn.com/jkimball.ma.ultranet/Bi ologyPages/V/Vision.htmlhttp://users.rcn.com/jkimball.ma.ultranet/Bi ologyPages/V/Vision.html

12. What is color? When we see color, we are seeing specific frequencies of visible light VISIBLE LIGHT IS ROYGBIV Red, orange, yellow, green, blue, indigo and violet For visible light –Red has the lowest frequency and longest wavelength –Violet has the highest frequency and shortest wavelength

13. When sunlight passes through a prism, it separates into a spectrum of all the colors of the rainbow. 28.1 The Color Spectrum roygbiv

14. Both the cornea and inner lens are convex (convergent) lenses The retina contains rod and cone cells that are photosensitive to different frequencies of visible light. Red-green- blue cone cells are the color receptors The pupil regulates the intensity of light entering the eye

16. 30.6 The Eye Inner lens moves to focus close up and far away images

17. Concave lens Convex lens

18. Vision correction Corrected by divergent (concave) lens Corrected by convergent (convex) lens

19. Concave lens Convex lens http://www.ghi.com/yourhealth/encyclopedi a/articles/color_blindness_basics.html http://micro.magnet.fsu.edu/primer/java/hu manvision/accommodation/index.html

20. Colorblindness Colorblindness is a deficiency in the number of red, green or blue cones (too few of one or more cone types). Normal vision Colorblindness http://www.toledo-bend.com/colorblind/aboutCB.html

21. http://www.colblindor.com/2008/10/02/color-blindness-simulator-new- tool-released-on-colblindor/