Visual Acuity and Refractive Error

Question 1

what two structures are involved in focusing an image on the back of the retina?

Answer 1

cornea 2/3rd

lens 1/3rd

Question 2

what is myopia?

Answer 2

short-sighted

image focused in front of lens

Question 3

management of myopia

Answer 3

concave lenses

Question 4

what is hypermetropia?

Answer 4

long-sighted

image focused behind the retina

Question 5

management of hypermetropia

Answer 5

correct with convex lenses

Question 6

what is an astigmatism?

Answer 6

irregular corneal curvature

Question 7

what is presbyopia?

Answer 7

loss of accommodation reflex due to stiffening with age

Question 8

what is used to test visual acuity?

Answer 8

Snellen chart

Question 9

how is visual acuity written?

Answer 9

top number is distance from chart

bottom number is what they can see