Cross Cylinder
(continued)
Manual Test
Note:
Tap
Test
to switch the type of XCyl test (Manual/Smart/Split Cyl).
The Manual Cross Cylinder test allows the user to refine Axis in 1°, 5°, or 10° increments, and adjust
Cylinder in ±0.25 D, ±0.50 D, or ±1.00 D increments. The Spherical equivalent is maintained during Cyl-
inder power adjustment.
1. Tap
XCyl
on the menu bar at the bottom of the main screen.
2. Tap
Manual
to start the test.
If the current Cylinder value is zero, an Astigmatism check will automatically start, and a 0.50 D JCC lens
will be placed in the Phoroptor head. Refer to the
Examination for Astigmatism
section of this manual.
Note:
5°
will appear in the lower left of the screen. Tap to cycle through
1°
,
5°
, or
10°
.
3. Turn the
CONTROL KNOB
to present position 1 and position 2 to the patient. The direction of the
Axis change is indicated in the lens aperture at the top of the screen. The orange lines represent the
current axis. The blue lines represent the direction of the axis change offered to the patient.
4. Ask the patient: “Which is better, 1 or 2?”
5. If the patient states a preference, tap
1
or
2
on the screen, or turn the
CONTROL KNOB
to that
number and press the button.
6. Repeat steps 3 - 5, until 1 and 2 are equal.
Note:
It is possible to adjust axis beyond the increment that was
selected for the axis adjustment. Turn the
CONTROL KNOB
8 click stops in one direction when offering position 1 or 2
to the patient. After the 8
th
click stop, the axis changes in
1°
increments. This allows the user to freely modify the axis in
that direction.
7. Press the
ENTER
button, or tap
Equal
on the screen, to advance to Cylinder power adjustment.
Performing an Exam
(continued)
49
16243-101 Rev. G
Содержание VISUTRON 900 Touch
Страница 1: ...VISUTRON 900 Touch User s Guide ...
Страница 85: ...Notes 85 16243 101 Rev G ...
Страница 86: ...Notes 86 16243 101 Rev G ...
Страница 87: ...Notes 87 16243 101 Rev G ...
