Accommodation - The Eye

Question 1

What is the accommodation reflex

Answer 1

changing thickness of lens to see short and far clearly

Question 2

Which two parts of the body control the lens shape

Answer 2

the ciliary muscles
the suspensory ligaments

Question 3

Why do we need the lens and cornea

Answer 3

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

Question 4

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

Answer 4

parallel

Question 5

Light rays from objects close are what when hitting the eye

Answer 5

widely angled

Question 6

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

Answer 6

FAT THICK to increase refractive power

Question 7

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

Answer 7

SKINNY to decrease level of refraction

Question 8

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

Answer 8

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

Question 9

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

Answer 9

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