Nidek Medical ARK-1S, Operator'S Manual

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OPERATING PROCEDURE: Retroillumination Image Observation
3.6 Retroillumination Image Observation

Whether opacity exists on crystalline lenses or vitreous body can be observed.
1
After KM measurement, hold down the ring image /
retroillumination button for about a second to
display the retroillumination image observation
screen (RETRO ILLUMINATION).
The device enters retroillumination image observation mode.
The auto tracking and auto focusing functions turn off and the
light quantity (LIGHT) is automatically controlled.
To change the light intensity manually, press the lamp
button. As the light intensity automatic control is deactivated,
change the light intensity with the displayed up button or
down button
.
2
Manipulate the joystick so that the opacity is in
focus and the corneal luminous spot is not promi-
nent, and then press the start button for image cap-
ture.
The captured retroillumination image (still image) is displayed
and the “ANALYZING...” message indicating that the opacity
indexes are being calculated is displayed for a few seconds.
CAUTION
• Opacity indexes should be taken as a reference value.
When images are captured under the following conditions, actual indexes may not be presented.
•
The border of a pupil is darkly displayed due to the alignment position.
•
The opacity is out of focus.
•
Bright spots of observation light reflected from the corneal vertex appear.
Depending on the position of the opacity, correct pupil detection may not be possible resulting in the
circle position indicating the 3 mm range in diameter to be deviated. Actual indexes may not be pre-
sented in such a case, either.
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