Eye Defects -Lens- -Retina-

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Eye Defects-Lens--Retina-

• By Daniel Drummond
• Graeme Paterson
• Conor McHugh

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Activity 1 Aim

• To find out where the light is focused in a
  normal eye
• Demonstration
• Explanation

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Activity 2 Aim

• To find out where light is focused in a
  short-sighted eye and find out how to correct
  this defect
• Demonstration
• Explanation

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Activity 3 Aim

• To find out where light is focused in a
  long-sighted eye and to find out how to correct
  this defect
• Demonstration
• Explanation

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You Should Now Know

• That short-sighted people can see close objects
  but far away objects are blurred
• That long-sighted people can see far away objects
  but close objects are blurred

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You Should Also Know

• That in short-sighted eyes, the light rays are
  focussed to a point before they get to the retina
• That in long-sighted eyes, the light rays are not
  focussed to a point by the time they reach the
  retina and the focus would be behind the retina

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You Should Also Know

• That concave lenses are used to correct
  short-sight
• That convex lenses are used to correct long-sight

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ANY QUESTIONS?!?!