lecture 18 spatial vision

Question 1

(T or F) visual acuity is the spatial resolving capacity of the visual system

Answer 1

true

Question 2

what is meant by “the smallest spatial detail that can be resolved”

Answer 2

definition of acuity

Question 3

a MAR equals ____ min of arc

Answer 3

1

Question 4

20/20 has a logMAR of ____

Answer 4

zero

Question 5

When a patient cannot read the big 20/200 “E” letter on the top of the chart, what are 4 alternatives to measuring V.A.?

Answer 5

1) counting fingers (CF)
2) hand motion (HM)
3) light perception (LP)
4) no light perception (NLP)

Question 6

(T or F) seeing more cycles per degree means that you have better visual acuity.

Answer 6

true

Question 7

hyperacuity is in regards to…

A) relative position
B) exact position

Answer 7

relative position.

Question 8

the diameter of the fovea is ___ degree(s)

Answer 8

1

Question 9

the diameter of our blind spot is _____ degree(s)

Answer 9

7.5 by 5 degrees, much larger than our fovea

Question 10

visual acuity declines with _____

Answer 10

eccentricity

Question 11

Which effect describes seeing 2 apparently different sized tables only because they were positioned differently, yet actually have the same size table top.

Answer 11

the cognitive effect, (same with zulu tribe example)

Question 12

High spatial frequency is found in ____ and low spatial frequency is found in _____

Answer 12

parvo, magno