AaM Vision & Visual Acuity 1

Question 1

Snellen optotype

Answer 1

used in visual acuity testing (letters/numbers getting progressively smaller)

Question 2

MAR

Answer 2

Minimum Angle Resolution, reciprocal of Snellen fraction

Question 3

logMAR

Answer 3

logarithm of the minimum angle of resolution
each line represents a change of 0.1 logMAR in visual acuity

Question 4

charts used to measure VA of children??

Answer 4

Picture Symbols
Cardiff acuity cards (>1yr) [thicker and thinner symbols]

Question 5

Vision??

Answer 5

determined from size of the smallest line of the letters in test chart that can be read by a person w/ naked eye (no optical correction)

Question 6

Visual Acuity??

Answer 6

Determined from the smallest line of letters in the test chart that can be read by a person WITH use of optical correction

Question 7

method of measuring visual perception in infants??

Answer 7

preferential looking: presenting infant w/ 2 stimuli, what they look at for longer is what they prefer, allows infants to discriminate between different visual stimuli.