Visual Acuity and Refractive Error Flashcards
1
Q
what two structures are involved in focusing an image on the back of the retina?
A
cornea 2/3rd
lens 1/3rd
2
Q
what is myopia?
A
short-sighted
image focused in front of lens
3
Q
management of myopia
A
concave lenses
4
Q
what is hypermetropia?
A
long-sighted
image focused behind the retina
5
Q
management of hypermetropia
A
correct with convex lenses
6
Q
what is an astigmatism?
A
irregular corneal curvature
7
Q
what is presbyopia?
A
loss of accommodation reflex due to stiffening with age
8
Q
what is used to test visual acuity?
A
Snellen chart
9
Q
how is visual acuity written?
A
top number is distance from chart
bottom number is what they can see
