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c. Centering a single vision lens using re-marked micro-engravings
Mark the micro-engravings present on the lens.
Mark the near vision micro-engravings with a felt tip marker.
Remark each micro-engraving with a felt tip marker. The diameter of the dots must be between 0.5 and 1.5 mm.
If the manufacturer marking forms two circles around the micro-engravings, erase them before marking the lens with a
felt tip marker.
We advise you to use:
the white felt tip marker supplied with the tracer to mark the lens
an alcohol-based solution such as Essiclean to remove existing markings.
TM
Press to select the type of single vision lens.
Press to select the centering mode starting at the micro-engravings.
Enter the half-PD and pupillary height.
Enter the half-PD and pupillary height.
If necessary, modify the distance between the PRP (prismatic reference point) and the centering cross .
This value is configured by default at 0 mm for the Essilor single vision lenses. This value may vary, depending on
lens manufacturers.
Position the lens in the middle of the centering chamber.
The centering target is displayed:>
The target moves.>
The target moves.>
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