Spatial contrast sensitvity function

Question 1

What should a comprehenive assessment of visual performance include?

Answer 1

A measurement of resolution capability and a measure of contrast detection capability

Question 2

What properties are included in a sinusoidal stimuli?

Answer 2

Spatial frequency
Amplitude
Orientation
Phase

Question 3

What is the peak sensitivity of the sCSF?

Answer 3

2-4 cycles/degree or a medium sptia frequency

Question 4

What is the high sptial frequency cut off?

Answer 4

45 cpd

MAR of 0.67 or 20/13 snellen

Question 5

What factors affect the high sptial frequency cut off?

Answer 5

Optical and neural

Question 6

What factors affect the low spatial frequency roll off?

Answer 6

Neural, aperture size and contrast adaptation

Question 7

What is the affect of the number of cycles visible through the aperture?

Answer 7

More cycles means the more accurate of an representation of the SF in the stimulus, and lower detection threshold

Question 8

What factors affect the sCSF?

Answer 8

Defocus
Pupil size
Retinal eccentricity
Temporal frequency