1.
This chapter describes the lens centering procedures according to the type of lens.
Description of the centering environment (p.39)
Centering a single vision lens (p.42)
Centering a progressive lens (p.52)
Centering a bifocal lens (p.58)
Centering an executive lens (p.64)
Centering a mid-distance lens (p.69)
Centering a lens for a high-base frame (p.76)
Saving a new marking (p.77)
This chapter also describes the procedure.lens blocking (p.80)
The tracer can be used to calculate the lens power. Nevertheless, is not categorized as a focimeter. Standard ISO8598-1
implies measurement on a cone 5 mm in diameter.
Tracer-centerer-blocker performance
To get the most out of the tracer-centerer-blocker and take advantage of all its features, we recommend that you follow the
advice below:
Eliminate any source of light (natural or artificial) pointing directly towards the centering chamber, to avoid interfering
with lens measurement and centering.
Check that the lenses are clean before proceeding with automatic centering.
Hartmann plate protective glass:
Clean the window located in the middle of the centering chamber regularly.
Replace it as soon as it shows traces of scratches in the center.
(For more information, consult the section Maintenance > Maintaining and cleaning the
.)tracer-centerer-blocker > Cleaning the protective glass of the Hartmann plate (p.132)
1. Centering environment
This section describes the centering screen and the various centering modes available:
Description of the centering screen (p.39)
Centering modes (p.41)
a. Menu screen
Centering screen indicator
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