How eyes work Flashcards

1
Q

give 7 different features of the eye. and locate them

A

1) retina
2) eye lens
3) cornea
4) iris
5) cillary muscles
6) optic nerve
7) pupil

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2
Q

how does light travel through the eye

A

enters through a hole called the pupil. the cornea and the lens focus the light to form a sharp image on the retina. the nerves in the retina convert the image into electrical signals that are sent to the brain along the optic nerve.

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3
Q

how does the eye focus the image

A

eye lens changes shape to produce a sharp image on the retina. when rays of light are coming from a distant object, eye lens are less curved. when rays of light are coming from a near object, eye lens are more curved

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4
Q

what is the far point

A

the most distant point an eye can focus on. for a normal eye, this is infinity.

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5
Q

what is the near point

A

the closest point on which the eye can focus. this is about 25cm for adults with normal vision

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