AQA · Biology · 8461
GCSE Biology: The eye
Homeostasis and response · AQA GCSE Biology (8461), specification point 4.5.2.3. Cards are generated from the exam board's own specification for "The eye", and every card links back to the page it came from. Separate science only. Specification © AQA — used with attribution.
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What is accommodation in the eye?
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The process of changing the shape of the lens to focus on near or distant objects.
What do the ciliary muscles do when the eye focuses on a near object?
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They contract, loosening the suspensory ligaments so the lens becomes thicker.
Why does a thicker lens help the eye focus on near objects?
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A thicker lens refracts light rays more strongly, bringing them to a focus on the retina.
What do the ciliary muscles do when the eye focuses on a distant object?
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They relax, so the suspensory ligaments are pulled tight and the lens is pulled thin.
When focusing on a distant object, the lens is pulled thin and only ? refracts light rays.
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slightly
Which two properties of light does the eye contain receptors for?
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Light intensity and colour.
What is the scientific name for short sightedness?
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Myopia.
What is the scientific name for long sightedness?
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Hyperopia.
In myopia and hyperopia, where do rays of light fail to focus?
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On the retina.
How do spectacle lenses correct myopia and hyperopia?
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They refract the light rays so that they focus on the retina.
Which part of the eye does laser surgery reshape to correct vision defects?
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The cornea.
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