------------------------------------------------------------------------- LM-7800 User Guide
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Cause 1 : The progressive area is expanded into the far vision focus
Solution : Place the cross ) at the close point to the center and press
"MEM" button to set the focus of far vision
Cause 2 : The far focus is close to the upper frame
Solution : Push the lens a little bit more while lifting up the lens holder in order
to detect the far focus
Difficult to detect the near vision focus
Cause 1 : The near focus is close to the lower frame
Solution : Pull the lens a little bit more while lifting up the lens holder in order
to detect the near focus.
Cause 2 : The near focus is cut out because of small framed lens
Solution : adjust the lens to make the level of vertical indicator minimized
whiling securing the tolerance range of horizontal indicator. Then
press "MEM" button to set the focus of near vision in case the add
power is maximized. (Measurement date may be a little bit different
from the actual data).
Error in the measurement data (especially the lens over -4D of near vision power)
Cause 1 : Lift up the lens by hand at the time of measurement
Solution : Place the lens holder over the lens in order to hold the lens by foot.
Then move the lens forward/backward or left/right for measurement.
Difficult to maintain the horizontal position in case of near vision measurement
Cause 1 : Wrong measurement of far vision focus
Solution : Retry the measurement of far vision focus
The marker (O, ) is displayed more than two times
Cause 1 : The lens is not properly manufactured (more than to points with the
deviation of progressive power)
Solution : Detect the maximized add value of the points.
