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5. Centering bifocal / trifocal lenses
Prerequisite: before carrying out lens centering, a shape must be displayed on the centering screen.
If necessary, we recommend that you first:
modify or retouch the traced shape (p.63)
prepare the drilling points (p.71) to be created (option)
place the stickers recommended by the manufacturer on hydrophobic lenses. (p.57)
Concerning the use of the stickers, be careful to change the centering tube with a larger diameter one to optimise the
effectiveness of the sticker.
This section describes the centering procedure for a bifocal or trifocal lens with a straight, curved or round segment.
Description of the centering target
Centering cross (orange cross) and the boxing center of the shape (blue cross)
Near vision mark
Centering marks
Centering the lens
Press to select the type of bifocal lens.
Enter the half PD for near vision and the frame height.
Lower the tube.
Insert the posiblock and its pad in the centering device.
The centering target is displayed:>
The target moves.>
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