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7. Key Concept: What are the main features of the retina?


7.    Key Concept: What are the main features of the retina? Describe each of these features.

The _________ contains a large number of _________  for detailed vision; the _________  is an area with a high density of _________  in the center of the _________ ; and the _________ which has optic nerve fibers and no photoreceptors.



8.    Key Concept: How does the eye bend light to focus on objects at different distances?

For objects at greater distances, the _________ relaxes, increasing tension in the _________  and _________  the _________  to bend light _________ . For _________  objects, the _________  muscle contracts, _________  tension on the lens so that it rounds up to bend light more.



9.    Key Concept: How does the shape of the eyeball affect focusing of light on the retina?

In the case of a shorter than normal eyeball, the _________  cannot round up enough, so light rays focus behind the _________  when viewing near objects (_________ ). When the eyeball is too long, the _________  cannot _________  enough, so light rays focus in front of the _________  when viewing distant objects (_________ ).


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