Refractive Error

Question 1

define

Answer 1

eyes cannot clearly focus an image on the retina

Question 2

what is responsible for focusing images on the retina?

Answer 2

cornea (2/3rd)

lens (1/3rd)

Question 3

different types

Answer 3

myopia
hypermetropia
astigmatism
presbyopia

Question 4

define myopia

Answer 4

short sighted
image focused in front of the lens
correct with concave lenses

Question 5

define hypermetropia

Answer 5

long-sighted
image focused behind the retina
correct with convex lenses

Question 6

astigmatism

Answer 6

irregular corneal curvature

Question 7

presbyopia

Answer 7

loss of accommodation reflex due to stiffening of the lens with age so cannot change shape as easily

Question 8

management

Answer 8

glasses