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Centering the lens
Press to select the type of progressive lens.
Enter the half PD and pupillary height.
Lower the tube.
Insert the posiblock and its pad in the centering device.
Raise the tube back into centering position.
Position the lens on the tube, with the convex side on the tube.
Slowly move the lens untilmanufacturer markings are:
Perfectly centered in the centering cross,
Parallel to the horizontal lines.
To block the lens, refer to the section .Centering a lens > Blocking a lens (p.57)
The centering target is displayed:>
The target moves.>
The lens is centered and ready to be blocked.>
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