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Other references

Werner Köppen: Konzeption und Entwicklung von Progressivgläsern (Conception and development of progressive lenses). Deutsche Optikerzeitung, no. 10, 1995

Werner Köppen: Objektive und subjektive Beurteilung von Gleitsichtgläsern (Objective and subjective assessment of variable focus lenses). Deutsche Optikerzeitung, no.10, 1989

Werner Köppen: Asphärische Spezialbrillengläser für die Arbeit am Bildschirm (Specific aspherical spectacle lenses for computer work). Optometrie, no.5, 1987

Werner Köppen: Neuentwickelte progressive Brillengläser (Newly developed progressive lenses). Deutsche Optikerzeitung, no.6, 1986

Werner Köppen: Progressive Brillengläser der neuen Generation-Progressiv Perfalit (New generation progressive lenses -Progressiv Perfalit). der Augenoptiker, no.4, 1980

Werner Köppen and Walter von Gelmini: Gerandete Progressivgläser mit minimaler Dicke durch Progressiv R-MDM (Edged progressive lenses with minimum thickness by Progressiv R-MDM). Deutsche Optikerzeitung, no.2, 1983

Werner Köppen and Rudolf Barth: Die Entwicklung eines neuen asphärischen Starbrillenglases (The development of a new aspherical cataract lens). Optometrie, no.4, 1982

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The Competition for Leadership when the Market for Progressive Lenses became global
1 First ideas, first patents
2 Breakthrough by Bernard Maitenaz
3 Competition shows up
4 Battle about the leadership of the progressive lens market
5 The Multi Design concept and the "boucle dioptrique"
6 Varilux Comfort, a new concept of the progressive lens
7 Essilor confirms the world leadership for PPL's
8 The change of the power balance in the ophthalmic lens industry
9 The progressive lens generations after Varilux Comfort
10 The fundamental role of service
References Progressive Memories
Years of fundamental change of the ophthalmic lens market
Other references