The Basics
(continued)
Adjusting Sphere
1. Activate the Sphere value field.
2. Turn the
CONTROL KNOB
to adjust the Sphere value by ±0.25 D, or press
and turn the
CONTROL KNOB
to adjust the Sphere value by ±1.00 D per
click stop.
3. Press the
CONTROL KNOB
to move to the next step.
Adjusting Cylinder
1. Activate the Cylinder value field.
2. Turn the
CONTROL KNOB
to adjust the Cylinder value by ±0.25 D, or
press and turn the
CONTROL KNOB
to adjust the Cylinder value by ±1.00
D per click stop.
3. Press the
CONTROL KNOB
to move to the next step.
Adjusting Sphere and Cylinder Together
The Sphere and Cylinder values can be simultaneously adjusted to maintain
the spherical equivalent.
1. Select
C
, then select
C
again to highlight both
S
and
C
, to activate Spheri-
cal Equivalent.
2. Turn the
CONTROL KNOB
to adjust the Sphere and Cylinder values together.
A change of ±0.50 D in Cylinder power results in a corresponding ±0.25 D
change in Sphere power.
Adjusting Axis
1. Activate the Axis value field.
2. Turn the
CONTROL KNOB
to adjust the Axis value by 1°, or press and turn
the
CONTROL KNOB
to adjust the Axis value by 10° per click stop. The
actual position of the Axis is graphically shown on the display in the lens
aperture icon.
3. Press the
CONTROL KNOB
to move to the next step.
Near Vision Addition
1. Lower the Near Vision Rod and Card to automatically activate the
Add
field,
converge the Phoroptor, and darken the Acuity Chart screen.
Note:
Make sure the reading rod is lowered. If the rod is not lowered,
“Convergence” displays at the top left of the screen and a “Beep” sounds.
2. Turn the
CONTROL KNOB
to adjust the Add value by ±0.25 D, or press
and turn the
CONTROL KNOB
to adjust the Add value by ±1.00 D per click
stop.
3. Press the
CONTROL KNOB
to save the value and exit Add mode.
4. Raise the Near Vision Rod and Card. The projector screen will illuminate again.
Performing an Exam
(continued)
47
16243-101 Rev. G
Summary of Contents for VISUTRON 900 Touch
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Page 85: ...Notes 85 16243 101 Rev G ...
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