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b. Centering a bifocal lens using three focimeter dots
In this mode, the lens is centered in far vision.
Prerequisite: The lens must be marked with the focimeter.
The three focimeter dots must be:
Lined up
At the same distance from the central dot
0.5 to 1.5 mm in diameter
For bifocal lenses with a round segment, first remove any manufacturer markings.
Centering the lens
Press to select the type of bifocal lens.
Press to select the automatic centering mode from three focimeter dots.
Enter the half-PD and pupillary height for far vision.
Position the lens in the middle of the centering chamber.
Press to start lens tracing.
Once the lens is held by the clamps, it must not be handled.
The centering target is displayed:>
The target moves.>
The clamps close on the lens to hold it in position until its blocking.>
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