This chapter describes the lens centering procedures according to the type of lens:
• Description of the centering environment (F p.38)
• Centering a single vision lens (F p.46)
• Centering a progressive lens (F p.49)
• Centering a bifocal lens (F p.53)
• Centering an executive lens (F p.55)
• Centering a mid-distance lens (F p.57)
This chapter also describes the procedure for lens blocking (F p.62) and the control and blocking
compensation (F p.67).
1. CENTERING ENVIRONMENT
This section describes the centering screen and the various centering modes available:
• Description (F p.38)
• Legend screen (F p.42)
• Job call (F p.45)
a. Description of the centering blocking system
Pre-requisite: before carrying out the centering of the lens, supply a posiblock and a pad Essilor.
Centering
Lower the tube manually.
Insert the posiblock and its pad in the centering device.
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