W4 Motor Fusion
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15 Terms
what is motor fusion
ability to maintain sensory fusion over a range of vergence movements
how can motor fusion be measured by
prism fusion range
20 D base out (prism reflex test)
synoptophore
what do you measure to test for motor fusion
fusional vergence
what is fusional vergence aka
fusional reserves
fusional amplitudes
prism fusional range
prism vergences
what is herings law of innervation
when a muscle in one eye contracts the muscle in the other eye contracts too
what happens to the eye if base Out added
cOnvergence
pOsitive fusion range
what happens to the eye if base In added
dIvergence
negatIve fusion range
what does base up measure
infravergence
what does base down measure
supravergence
prism break value for distance base in
5-7
prism break value for distance base out
15
prism break value for near base in
15
prism break value for near base out
35-40
who is the 20D prism base out test carried out in
young infants
adults with learning difficulties
short time in practice
no prism bar
what is the 4 prismD base out test used to check for
macula suppression