Chapter 14 The Human Eye How Eyes Focus on Near Objects 21 March 2016.

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Presentation transcript:

Chapter 14 The Human Eye How Eyes Focus on Near Objects 21 March 2016

Copyright © Marshall Cavendish International (Singapore) Pte. Ltd. 2 Vertical section of the eye Diverging light rays from near object enters eyes 1 How Eyes Focus on Near Objects

21 March 2016 Copyright © Marshall Cavendish International (Singapore) Pte. Ltd. 3 Vertical section of the eyeEnlarged portion of eye (front view) Ciliary muscles contract How Eyes Focus on Near Objects

21 March 2016 Copyright © Marshall Cavendish International (Singapore) Pte. Ltd. 4 Vertical section of the eyeEnlarged portion of eye (front view) Suspensory ligaments become slacken How Eyes Focus on Near Objects

Copyright © Marshall Cavendish International (Singapore) Pte. Ltd. 5 Vertical section of the eyeEnlarged portion of eye (front view) Lens becomes thicker 21 March How Eyes Focus on Near Objects

Copyright © Marshall Cavendish International (Singapore) Pte. Ltd. 6 Vertical section of the eyeEnlarged portion of eye (front view) Focal length decreases 21 March How Eyes Focus on Near Objects

21 March 2016 Copyright © Marshall Cavendish International (Singapore) Pte. Ltd. 7 Vertical section of the eyeEnlarged portion of eye (front view) Light rays from near object focused on retina How Eyes Focus on Near Objects

21 March 2016 Copyright © Marshall Cavendish International (Singapore) Pte. Ltd. 8 Vertical section of the eyeEnlarged portion of eye (front view) Photoreceptors stimulated How Eyes Focus on Near Objects

Copyright © Marshall Cavendish International (Singapore) Pte. Ltd. Vertical section of the eyeEnlarged portion of eye (front view) 21 March Photoreceptors stimulated Nerve impulses produced by optic nerves How Eyes Focus on Near Objects

Copyright © Marshall Cavendish International (Singapore) Pte. Ltd. Vertical section of the eyeEnlarged portion of eye (front view) Photoreceptors stimulated Nerve impulses produced by optic nerves 21 March Transmission of nerves to brain How Eyes Focus on Near Objects

Copyright © Marshall Cavendish International (Singapore) Pte. Ltd. Vertical section of the eyeEnlarged portion of eye (front view) Photoreceptors stimulated 21 March Nerve impulses produced by optic nerves Transmission of nerves to brain Brain interprets impulses How Eyes Focus on Near Objects

Copyright © Marshall Cavendish International (Singapore) Pte. Ltd. Vertical section of the eyeEnlarged portion of eye (front view) Photoreceptors stimulated 21 March Nerve impulses produced by optic nerves Transmission of nerves to brain Brain interprets impulses Person sees the near object How Eyes Focus on Near Objects 4

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