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e. Centering a single vision lens in manual mode
Manual centering enables you to center the lenses which:
cannot be centered in automatic mode
cannot be centered automatically using the three focimeter dots
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
Description of the centering target
Optical center of the lens (white cross) and boxing center of the shape (blue cross)
Centering marks
Centering the lens
Press to select the type of single vision lens.
Press to select the manual centering mode.
Enter the half-PD and pupillary height.
Position the lens on the clamps and center it in keeping with the target.
You can control the opening and closing of the clamps for better control of the stability of the lens:
Press to open the clamps.
Press to close the clamps.
As soon as you place the marked lens on the clamps, the tracer automatically detects the focimeter dots.
You can choose to center the lens on the protective glass: open the clamps completely.
Do not manually center the (thickness < 0.8 mm) directly on the window. Theprecalibrated lenses
(p.149)
lenses would be liable to break during blocking.
Take care not to damage the protective glass with glass lenses.
Press to zoom.
The clamps close:the image of the centering chamber is displayed in real time.>
The white target moves.>
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