B1 The Eye
- Created by: GeorgeBarton
- Created on: 06-03-16 09:33
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- The Eye
- Parts of Eye
- Cornea: Refracts light
- IIris: controls how much light enters pupil
- Lens: Focuses on Retina
- Retina: Coverd in rods and cones, which detect light
- Rods: Sensitive to dim light, can't see colour
- Cones:: Sensative to colours, not good in dim light
- Optic nerve: Carries impulses to brain
- Focusing
- Distant objects: Ciliary muscles relax, allows suspensory ligaments to pull tighter
- This pulls lens into less rounded shape, so less light is refracted
- Close Objects: Ciliary muscle contracts, slackens suspensory ligaments
- Lens becomes more rounded, light is refracted more
- Distant objects: Ciliary muscles relax, allows suspensory ligaments to pull tighter
- Long Sightedness + Short Sightedness
- Long sighted: Occurs when lens is wrong shape, therefore does not bend light enough
- Glasses or contact lenses with a convex lens can be used to correct this
- Short sighted: Lens bends too much light
- Can use glasses or contact lenses with concave lens to correct this
- Long sighted: Occurs when lens is wrong shape, therefore does not bend light enough
- Parts of Eye
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