4. CENTERING BIFOCAL / TRIFOCAL LENSES
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 centering procedure for a bifocal or trifocal
&
lens with a straight, curved or round
segment.
Description of the centering target
1. Centering cross (orange cross) and the boxing center of the shape (blue cross)
2. Near vision mark
3. Centering marks
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