The nervous system
- Created by: MollieKate
- Created on: 02-10-13 18:54
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- The nervous system
- How does the eye work?
- The main parts of the eye have special functions
- Light rays are refracted (bent) by the cornea and lens
- The retina contains light receptors. Some are sensitive to different colours
- Binocular vision helps to judge distance by comparing the images from each eye; the more different they are, the nearer the object
- The eye can focus light from distant or near objects by altering the shape of the lens. This is called accomodation
- to focus on the distant objects the ciliary muscles relax, and the suspensory ligaments tighten, so the lens has a less rounded shape.
- To focus on near objects, the ciliary muscles contract and the suspensory ligaments slacked, so the lens regains a more rounded shape due to it elasticity
- Faults in vision
- Red-green colour blindness is cause by a lack of specialised cells in the retina
- Untitled
- How does the eye work?
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