| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
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Students should be able to relate the structures of the eye to their functions. This includes accommodation to focus on near or distant objects. |
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How do the cilliary muscles and the suspensory ligaments allow the eye to focus on near or distant objects? |
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Another adaptation is to dim light - The eye is a sense organ containing receptors sensitive to light intensity and colour. |
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How is the eye adapted to its function? |
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Students should be able to identify the following structures on a diagram of the eye and explain how their structure is related to their function: ? retina
? optic nerve
? sclera
? cornea
? iris
? ciliary muscles
? suspensory ligaments. |
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How are the structures of the following related to their functions:
- retina
- optic nerve
- sclera
- cornea
- iris
- ciliary muscles
- suspensory ligaments? |
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Accommodation is the process of changing the shape of the lens to focus on near or distant objects. |
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What is accommodation? |
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To focus on a near object: ???? the ciliary muscles contract ?? the suspensory ligaments loosen ???? the lens is then thicker and refracts light rays strongly. To focus on a distant object:
? the ciliary muscles relax
? the suspensory ligaments are pulled tight
? the lens is then pulled thin and only slightly refracts light rays. |
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What processes must the eye go through in order to focus on a near object or on a distant object? |
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Two common defects of the eyes are myopia (short sightedness) and hyperopia (long sightedness) in which rays of light do not focus on the retina. ??? |
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What are myopia and hyperopia and how do they affect the eye? |
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Generally these defects are treated with spectacle lenses which refract the light rays so that they do focus on the retina. |
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What are myopia and hyperopia usually treated with and how do they help? |
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New technologies now include hard and soft contact lenses, laser surgery to change the shape of the cornea and a replacement lens in the eye. |
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What new technologies are there in place to treat eye defects? |
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Students should be able to interpret ray diagrams, showing these two common defects of the eye and demonstrate how spectacle lenses correct them. |
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