3. CENTERING A PROGRESSIVE LENS
Prerequisite: before carrying out lens centering, a shape must be displayed on the centering screen.
If necessary, we recommend the following prior operations:
• Modifying or retouching the traced shape (F p.65)
• Preparing the drilling points to be created (option) (F p.73)
• Place the stickers recommended by the manufacturer on hydrophobic lenses.
This section describes the procedures for centering a progressive lens
&
:
• using re-marked micro-engravings mode (F p.47)
• using manufacturer markings mode (F p.50)
Description of the centering target
1. Centering cross (orange cross) and boxing center of the shape (blue cross)
2. Centering graduated marks
The horizontal lines are spaced 2mm apart enabling you to measure the PRP distance.
3. Near vision mark
a. Centering a progressive lens using re-marked micro-engravings
Prerequisite
• Remove all the original markings.
• Remark the micro-engravings with the marker; the points must have a diameter ranging between 0.5
and 1.5 mm.
We advise you to use the white felt tip marker supplied with the tracer-centerer-blocker to mark the
lens.
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