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. Colors:additive and subtractive http://mysite.verizon.net/vzeoacw1/colorsu b.htmlhttp://mysite.verizon.net/vzeoacw1/colorsu b.html http://mysite.verizon.net/vzeoacw1/colorad d.htmlhttp://mysite.verizon.net/vzeoacw1/colorad d.html

8. 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)

9. 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 <> <> <> <>

10. 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

11. a.This square reflects all the colors illuminating it. In sunlight, it is white. When illuminated with blue light, it is blue. b.This square absorbs all the colors illuminating it. In sunlight it is warmer than the white square. 28.2 Color by Reflection

12. Why a shirt appears blue. A blue shirt appears blue in white light because it reflects only blue and absorbs red and green (or the other colors) A blue shirt appears black in red light because it absorbs red and reflects nothing. A blue shirt appears blue in blue light because is reflects blue. A white shirt appears blue in blue light because it can reflect blue light.

13. Why a shirt appears blue. A blue shirt appears blue in white light because it reflects only blue and absorbs red and green (or the other colors) A blue shirt appears black in red light because it absorbs red and reflects nothing. A blue shirt appears blue in blue light because is reflects blue. A white shirt appears blue in blue light because it can reflect blue light.

14. 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

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

18. 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

19. 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

20. 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

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

22. 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

24. 30.6 The Eye Inner lens moves to focus close up and far away images

25. Concave lens Convex lens

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

27. 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

28. Concave mirror causes light rays to diverge. Convex mirror causes light rays to converge. CONCAVE AND CONVEX MIRRORS