Accommodation - The Eye Flashcards

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1
Q

What is the accommodation reflex

A

changing thickness of lens to see short and far clearly

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2
Q

Which two parts of the body control the lens shape

A

the ciliary muscles
the suspensory ligaments

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3
Q

Why do we need the lens and cornea

A

refract light so it focuses directly on the fovea(retina)

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4
Q

Light rays from objects far away are almost what once hitting the eye

A

parallel

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5
Q

Light rays from objects close are what when hitting the eye

A

widely angled

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6
Q

What does the lens need to be like when looking at things close

A

FAT THICK to increase refractive power

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7
Q

What does the lens need to be like when looking at things far away

A

SKINNY to decrease level of refraction

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8
Q

In order to focus on things far away what do the ciliary muscles and suspensory ligaments do and how does it effect the lens

A

ciliary muscles relax
suspensory ligaments are pulled taught to pull the lens tight
decreasing its thickness

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9
Q

In order to focus on things up close what do the ciliary muscles and suspensory ligaments do and how does it effect the lens

A

ciliary muscles contract inwards
suspensory muscles therefore slackens the lens
allowing it to return to its normal fatter size

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