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thumbnail Varilux 2 - Varitwo Fitting Aid
Norville Optical Co Ltd; Essel
c.1975
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thumbnail Varilux 2 technique Orma centration chart (EDI 634)
Essilor
Early 1980s
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thumbnail Varilux 2 centration chart (EDI 549)
Essilor
Early 1980s
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thumbnail Gradal HS / Uro Gradal HS / Umbramatic SR Gradal HS / Umbramatic SB Gradal HS / Clarlet Gradal HS
Zeiss
1986
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thumbnail Percentage Comparisons with Orma lenses / Absolute Values
Essilor
1999
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