Ecleris VNG Plus - Changing Goggle Cushions; Fuse Replacement Procedure; Component Disposal Guidelines

85
SACCADE
Velocity: peak eye
velocity
Latency: reaction time in
msec.
Accuracy:
undershoots/overshoots
Latency:
Age 50 and under : >260
msec
Age 60- 69: >270 msec
Age 70- 79: >280 msec
Age 80– 89: >290msec
Age 90 and above: 300
msec
Velocity:
Age 50 and under: <240
deg/sec
Age 60- 69: < 230º/sec
Age
70-79: <220 º/sec Age
80-89:
< 210 º/sec
Age 90 and above: <200
º/sec
Accuracy:<55%
Significant saccadic
slowing, overshooting
or undershooting: CNS
lesion or ocular
disorder Lower velocity
of trailing eye:
Internuclear
ophthalmoplegia (
Brain stem)
OPTOKINETIC
NYSTAGMUS Gain: eye
velocity/ target velocity.
Symmetry= SPV right/
SPVleft
Gain < 60% is abnormal.
Symmetry > 30%
difference is abnormal.
SPV < 6.0 is abnormal
Symmetrical low gain:
impaired vision or
likely CNS (parietal)
lesion.
DIX-HALLPIKE >2 eats (horizontal) with
average velocity >6.0
deg/sec.
delay onset of Nystagmus
paroxysmal Nystagmus
associated with vertigo
fatigable Nystagmus
Unilateral: Usually
peripheral undermost
ear. Bilateral:
peripheral (both ears)
or CNS
BPPV: both horizontal
and vertical
Nystagmus (with
possible rotation)