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OPERATING PROCEDURE: AR (refractive error) and KM (corneal curvature radius) Measurements
• When the specified number of KM measurements is not obtained,
is displayed on the
screen. Pressing
performs KM measurement.
When the specified number of measurements is obtained,
is displayed on the screen.
• If the device goes out of alignment and focus during measurement, the measurement is interrupted.
If measurement is retried, the measured results are incorporated to the former results and saved.
• To perform additional measurements after
is displayed, press
again. The mes-
sage disappears and the screen returns to the measurement screen.
• A maximum of 10 measurement data sets for each eye can be temporarily saved in the memory.
If measurements exceed 10, the data is erased in order from the oldest.
• If the measurement results exceed the measurement range, the following error code (measurement
range over error) appears.
Err + OVR ... During AR measurement: The spherical power is over the measurement range of the +
side.
During KM measurement: The corneal curvature radius is too large and over the mea-
surable limit.
Err - OVR ... During AR measurement: The spherical power is over the measurement range of the -
side.
During KM measurement: The corneal curvature radius is too small and not within the
measurable limit.
Err COVR ... During AR measurement: The cylindrical power is over the measurement range.
• Other errors during measurement are as follows:
•
Err BLK ... Measurement failed due to the patient blinking.
•
Err CONF ... Low-confidence data is obtained due to corneal distortion (only for AR measurement).
• If measurement fails, the cause may be due to the following:
a. The patient blinked during measurement. (Err BLK)
b. The eyelid or eyelashes are on the minimum pupil diameter mark during AR mea-
surement.
The eyelid or eyelashes are on the mire ring during KM measurement.
c. The patient’s pupil is smaller than the minimum pupil diameter mark.
(Darken the room so that the pupil diameter becomes large enough for measure-
ment.)
d. Retinal reflection is extremely low due to an optical disease such as a cataract
and corneal opacity.
There is some unusual reflection on the cornea during measurement.
e. There is an extreme distortion on the cornea. (Err CONF)
• The number of measurements shows the number of data of performed measurements.
• To save the measurement results,
“3.10.1 Saving memory data” (page 77)
.
• To print the measurement results,
“3.8 Printing Measured Values” (page 71)
.
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