B3.1.3- the eye

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11 Terms

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<p>what are the features that make up the eye- A,B,C,D,E,F,H,L 7</p>

what are the features that make up the eye- A,B,C,D,E,F,H,L 7

E. lens- focuses light onto retina

B. suspensory ligaments- connects ciliary muscle to lens

A. ciliary muscle- alters shape of lens

C. iris- alters pupil size by contracting or relaxing

D. pupil- allows light to enter eye

H. optic nerve

F. cornea- protects eye

L. retina- light receptor

<p>E. lens- focuses light onto retina</p><p>B. suspensory ligaments- connects ciliary muscle to lens</p><p>A. ciliary muscle- alters shape of lens</p><p>C. iris- alters pupil size by contracting or relaxing</p><p>D. pupil- allows light to enter eye</p><p>H. optic nerve</p><p>F. cornea- protects eye</p><p>L. retina- light receptor</p><p></p>
2
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what is the process of you creating an image to your eyes 3

  1. light comes through pupil

  2. it then goes into the retina and produces a nerve impulse

  3. this goes down the optic nerve to the brain where it produces a visual image.

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what happens when your ciliary muscle CONTRACTS

your lens becomes fatter and MORE convex.

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what happens when the ciliary muscle RELAXES

your lens becomes thinner and LESS convex

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when your at a short sight where does the light go

in front of the retina

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what do you need when you are short sighted and how does it help

a CONCAVE lens and it bends light outwards

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when your sight is long where does the light go

behind the retina

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what do you need when you are long sighted and how does it help

you need a convex lens which bends light inwards

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what are the retinas 2 type of photoreceptors cells

Rod cells and Cone cells

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what do Rod cells do

they respond to light and allow you to see in low light levels. they are NOT responsive to different colours

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what do cone cells do

they respond to different colours. different Cone cells respond to red, blue, and green light