Vergence Eye Movements TopHat

Question 1

T/F: vergence eye movements (EM) moves the eyes in same direction so images of a single object are held simultaneously on both fovea

Answer 1

false → moves the eyes in opposite direction

Question 2

T/F: VMC is a type of empirical horopter

Answer 2

false → equiangular (geometric) horopter

Question 3

T/F: uncrossed binocular disparity may stimulate negative fusional vergence (divergence)

Answer 3

true

Question 4

T/F: disparity convergence latency value is 180 ms

Answer 4

true

Question 5

T/F: during disparity vergence the initial 200 msec portion if effectively a closed-loop

Answer 5

false → open loop

Question 6

T/F: a horizontal disparity vergence response takes approximately 8 seconds to complete

Answer 6

false → approximately 1 second to complete

Question 7

T/F: accommodative vergence is only present during monocular conditions, but not during binocular conditions

Answer 7

false → present in both monocular & binocular conditions

Question 8

T/F: disparity vergence fast system uses a leaky integrator with a time constant of ~10 sec

Answer 8

true

Question 9

T/F: both high & low AC/A ratios indicates normal binocular vision

Answer 9

false → indicates binocular vision problems

Question 10

T/F: alcohol causes decrease in AC/A ratio

Answer 10

true

Question 11

T/F: in main sequence, peak vergence velocity increases as vergence amplitude increases, with a ratio of approx. 4:1

Answer 11

true

Question 12

T/F: lesion of dorsal vermis leads to exodeviation (excess divergence)

Answer 12

false → lesion of fastigial oculomotor region

lesion of dorsal vermis leads to esodeviation (excess convergence)

Question 13

T/F: patient w/ head trauma has normal vergence

Answer 13

false → abnormal vergence