7
6
5
Raise the tube back into centering position.
Position the lens on the tube, with the convex side on the tube.
Move the lens slowly until the top of the segment is in the center of the target.
D-SEGMENT ROUND SEGMENT
If your bifocal segment (round or right) is not visible or if you wish to improve its visibility on the screen, you must
re-mark it using a white felt tip marker, while following the contour of the segment.
To block the lens, refer to the section .Centering a lens > Blocking a lens (p.57)
6. Centering an executive lens
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 procedure for centering an executive lens.
Prerequisite: the lens must be marked usinga focimeter.
The three focimeter dots must be:
aligned,
at the same distance from the central dot,
0.5 to 1.5 mm in diameter.
of white colour
At the time of the release of the lens on the centering tube, be sure to align the three focimeter dots with the notches
designed for this purpose in order not to alter the marking.
In the case of a demonstration lens or a recut lens, make sure that the marking feature is perfectly horizontal to avoid any
axis deviation during centering.
For more information, consult the section performing an optical tracing > Optical tracing > Prepare the optical tracing of a demo lens
or of recut lens. (p.27)
The lens is centered and ready to be blocked.>
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