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The Eye

The Eye. EYE. The eye is an extension of the brain. Eye brain proxomity. Can you see : the optic nerve bundle? Spinal cord?. Cross section. You must know the position of: Retina Lens Cornea Sclerotic Optic nerve Cilary muscles Suspensory ligaments. Retina – receives the image.

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The Eye

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  1. The Eye www.assignmentpoint.com

  2. EYE The eye is an extension of the brain www.assignmentpoint.com

  3. Eye brain proxomity • Can you see : • the optic nerve bundle? • Spinal cord? www.assignmentpoint.com

  4. Cross section You must know the position of: Retina Lens Cornea Sclerotic Optic nerve Cilary muscles Suspensory ligaments www.assignmentpoint.com

  5. Retina – receives the image • Full of light receptors which are sensitive to: • Colour • Light levels • Massive blood supply is also needed Fovea is the main focal point and has greatest density of light receptors www.assignmentpoint.com

  6. Retina receptors • Light receptors are called rods and cone www.assignmentpoint.com

  7. Focusing on objects • The lens and cornea focus the light on the retina www.assignmentpoint.com

  8. Focusing • The lens job is to make the rays hit the same point The red rays will be out of focus www.assignmentpoint.com

  9. Bending light • Light is refracted and bent to focus it as it passes through the lens • Lens thickness can be changed so the amount of bending is changed www.assignmentpoint.com

  10. Near vision • to bend the light more to focus it • Fat lens needed www.assignmentpoint.com

  11. Distance vision • Rays enter the eye closer together • Need less bending • Thinner lens needed www.assignmentpoint.com

  12. Changing lens thickness • Cilary muscles are attached to the lens, when contracted they pull the lens thin • The lens is slightly elastic, its relaxed state is short and fat. www.assignmentpoint.com

  13. Controlling light levels • Your eye are very sensitive and can be damaged by harsh light. • Your iris controls light allowed into the eye by changing the size of the pupil www.assignmentpoint.com

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