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The Eye

The Eye. Function, Structure, Focus, Vision Correction . Stare at bird for 30 s and look to left—what color is the ghost image?. Stare at bird for 30 s and look to left—what color is the ghost image?. Cyan (blue light + green light) Your red cone receptors are fatigued, so you

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The Eye

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  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. Stare at bird for 30 s and look to left—what color is the ghost image? • 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.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). Colorblindness Normal vision http://www.toledo-bend.com/colorblind/aboutCB.html

  8. Better Eyes • http://micro.magnet.fsu.edu/primer/java/humanvision/accommodation/index.html

  9. Rods and Cones • http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/V/Vision.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. 28.1The Color Spectrum When sunlight passes through a prism, it separates into a spectrum of all the colors of the rainbow. roygbiv

  12. The pupil regulates the intensity of light entering the eye 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

  13. 30.6The Eye Inner lens moves to focus close up and far away images

  14. Concave lens Convex lens

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

  16. Concave lens Convex lens http://www.ghi.com/yourhealth/encyclopedia/articles/color_blindness_basics.html http://micro.magnet.fsu.edu/primer/java/humanvision/accommodation/index.html

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

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

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