5-3
5.1 TROUBLESHOOTING GUIDE
5.1.2 Progressive Addition Lens Measurement
1) The Cursor Cannot be Centered in the Progressive Channel.
Cause 1: With progressive lenses which have a small power difference
between the far point area and the near point area, aligning the
cursor to the center may not be achievable.
Action : The beginning of the progressive channel is located in
approximately the center of the lens or the center of the
frame. Take measurement around that position and press
the HOLD button.
2) The Cursor Cannot be Centered in the Far Point Area.
Cause 1: Progressive lenses are sometimes dispensed for intermediate
and near correction only. In such lenses, the progressive area
extends into the far point area and it is difficult to accurately
measure the far point area.
Action: Take a reading near the top of lens.
Slightly move the lens back and forth, right and left, near
the central top portion of the lens. Regard the area where
the SPH value varies the least as the measurement of the
far point area. Press the HOLD button when this location
is found.
3) The Near Point Area is not Detected. (The Cursor does not Change to " " or
" ".)
Cause 1: The near point area is NOT automatically detected if the ADD
power is less than 1.0 diopter.
Action: Press the HOLD button when judging the highest
addition value when the cursor is in the progressive zone.
Cause 2: The near point area in frame lenses with a long progressive
zone may be positioned very near the edge of the frame or even
outside of the frame. It may not be possible to detect the near
point in such lenses.
Action: Press the HOLD button when judging the highest
addition value when the cursor is in the progressive zone.
To Next Page
Loading...
Need help?
General
