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Sight

11. 2. Sight. The structure of our eye. eyeball. eye muscles. orbit ( 眼窩 ). eye muscles. skull. The structure of our eye. The front surface of the eye is protected by:. eyebrow ( 眼眉 ). prevents sweat from getting into the eye. The structure of our eye.

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Sight

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  1. 11.2 Sight

  2. The structure of our eye eyeball eye muscles orbit (眼窩) eye muscles skull

  3. The structure of our eye The front surface of the eye is protected by: eyebrow (眼眉) prevents sweat from getting into the eye

  4. The structure of our eye The front surface of the eye is protected by: eyelashes (眼睫毛) trap tiny objects and prevent them from getting into the eye

  5. The structure of our eye The front surface of the eye is protected by: eyelid (眼瞼) can be closed to protect the eye from dirt and strong light

  6. 11.1 3D model Examining the human eye model Examine the structure of the eye model and label the diagram.

  7. 11.1 a b cornea sclera c d lens iris

  8. 11.1 e g pupil retina h optic nerve f jelly-like fluid

  9. 11.2 Experiment video Dissecting an ox eye 1 Examine the outer parts of the eye. ox eye Petri dish

  10. 11.2 2 Cut away the eyelid, fatty substance around the eyeball and eye muscles.

  11. 11.2 2 Press the sclera gently.

  12. 11.2 Is the sclera tough? Yes. 2

  13. 11.2 3 cut

  14. 11.2 3 front half back half

  15. 11.2 Identify the cornea, irisand pupil. 3 pupil cornea iris front half back half

  16. 11.2 a What is the colour of the cornea? Colourless/Transparent. pupil cornea iris front half

  17. 11.2 b What is the colour of the iris? Black. iris front half

  18. 11.2 What is the colour of the lens? Colourless/Transparent. 4 lens

  19. 11.2 Does the print change in size? How? Yes. It becomes bigger. 5 lens newspaper

  20. 11.2 6 Press gently.

  21. 11.2 How does the print change in size when compared to the print in step 5? It becomes smaller. 6

  22. 11.2 7 retina back half

  23. 11.2 8 optic nerve blind spot(盲點)

  24. The structure of our eye Cornea Allows light to enter the eye.

  25. The structure of our eye Cornea Its curved surface helps focus light onto the retina.

  26. The structure of our eye Sclera A tough white coat; protects the eyeball.

  27. The structure of our eye Iris Controls the size of the pupil.

  28. The structure of our eye Pupil Allows light to enter the eye.

  29. The structure of our eye Lens Helps focus light onto the retina.

  30. The structure of our eye Jelly-like fluid Maintains the shape of the eyeball.

  31. The structure of our eye Jelly-like fluid Helps focus light that enters the eye.

  32. The structure of our eye Retina The image of an object is formed on it. It contains light-sensitive cells.

  33. The structure of our eye Optic nerve Sends messages from light‑sensitive cells to the brain.

  34. How do we see?

  35. How is an image formed in the eye? retina 3D animation cornea optic nerve lens

  36. How is an image formed in the eye? 1 Light from an object enters the eye.

  37. How is an image formed in the eye? 2 The cornea, the lens and the jelly-like fluid focus the light onto the retina.

  38. How is an image formed in the eye? 2 A sharp and inverted image is formed.

  39. How is an image formed in the eye? 3 The light-sensitive cells on the retina are stimulated by light.

  40. How is an image formed in the eye? They send messages to the brain along the optic nerve. 3 brain

  41. How is an image formed in the eye? 4 The brain interprets the messages as an upright image.

  42. How is an image formed in the eye? The process of how we see: light from an object cornea lens bends the light

  43. How is an image formed in the eye? The process of how we see: lens retina bends the light which is then focused onto

  44. How is an image formed in the eye? The process of how we see: retina light-sensitive cells (receptors) contains

  45. How is an image formed in the eye? The process of how we see: light-sensitive cells (receptors) brain stimulated by the light and send messages to

  46. How is an image formed in the eye? The process of how we see: brain upright image of the object interprets the messages as

  47. Seeing objects at different distances focusing on the words near objects

  48. Seeing objects at different distances focusing on the bird distant object

  49. Seeing objects at different distances How can we see objects at different distances?

  50. 11.3 Experiment video Focusing with lenses of different thickness screen thin convex lens 1 light source

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