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'Aphax' bifocal lens
Essilor
20th c.
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'Atoz' prism-controlled solid bifocal lens
Stigmat Ltd
1950s?
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'Atoz' prism-controlled solid bifocal lens
Stigmat Ltd
1950s?
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'Bi-Liptic' solid bifocal lens
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'Bi-Liptic' solid bifocal lens
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'Clarlet' bifocal lens
Zeiss
20th c.
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'Duopal' C25 fused bifocal lens
Zeiss
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'Duopal' SL C25 Mid-Index fused bifocal lens
Zeiss
Mid-late 20th c.
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'Executive' (E-type) solid bifocal lens
20th c.
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'Executive' (E-type) solid double bifocal lens
20th c.
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'Franklin-type' Split Bifocal lens
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'Ful-Vue' fused bifocal lens
American Optical Co
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'Glaukar' C40 fused bifocal lens
Zeiss
20th c.
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'Hi Drop' bifocal lens
Sola Optical Co
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'Hi-Drop' bifocal lens
Sola Optical Co
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'Highlite' solid bifocal lens
c.1970s
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'Igard' solid bifocal lens
Combined Optical Industries Ltd
1947
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'Invisible' upcurve solid bifocal lens
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'Luxe' invisible solid downcurve bifocal lens
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'Luxe' invisible solid downcurve bifocal lens
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'Luxe' invisible solid downcurve bifocal lens
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'Multifield' lenticular bifocal lens
20th c.
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'Myoplet' lenticular bifocal lens
20th c.
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'Norbond' cemented bifocal lens: round segment
20th c.
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'Omega' bifocal lens
Essilor
20th c.
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'Orma Télégic' bifocal lens
Essilor
1961
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'Orma Télémilaric' bifocal lens
Essilor
20th c.
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'Orma Telex' bifocal lens
Essilor
1958
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'Orma' bifocal lens
Essilor
20th c.
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'Panoptik' fused bifocal lens
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'Perfection' Split Bifocal lens
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'Solette' monaxial solid bifocal lens
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'Stigmalentic' lenticular bifocal lens
20th c.
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'Tangal' no-jump solid downcurve bifocal lens
Carl Zeiss (Jena)
20th c.
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'Tru-tilt' bi-planar solid bifocal lens
Courmettes, H.
20th c.
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'Ultex' invisible solid downcurve bifocal lens (replica)
c.1990
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Adite Lenticular Aspheric bifocal lens
20th c.
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Aspheric Lenticular bifocal lens
20th c.
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Bi-Liptic Bi-Focal Lenses
Early 20th c.
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bifocal lens
Sola Optical Co
20th c.
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bifocal lens
Armorlite
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Bifocal lens
20th c.
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Bifocal lens
20th c.
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bifocal lens
Mid-Late 20th c.
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Bivue fused bifocal lens
M. Wiseman & Company Ltd
1950s
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Bivue fused bifocal lens
M. Wiseman & Company Ltd
Mid 20th c.
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Bivue fused bifocal lens
M. Wiseman & Company Ltd
c.1954-1955
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Cemented bifocal lens: 'Jump-Free' crescent segment
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Cemented bifocal lens: 'Wafer' segment
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Cemented bifocal lens: Crescent segment
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Cemented bifocal lens: Prismatic segment
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Cemented bifocal lens: Straight-top segment
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Charles Hymans' upcurve solid bifocal lenses
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Early 'Kryptok' fused bifocal lens
Kryptok Ltd
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Early 'Kryptok' fused bifocal lens
Kryptok Ltd; C. W. Dixey & Son Ltd
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Early fused bifocal lens
Zeiss
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Fused bifocal lens
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fused bifocal lens
1950s?
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Hoya 'Alpha' D28 bifocal lens
20th c.
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Hoya Super-CT28 fused bifocal lens
20th c.
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Hyperaspheric bifocal lens
Late 1970s/early 1980s
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Invisible solid concentric double bifocal lens
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Invisible solid concentric step down bifocal lens
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Invisible solid downcurve bifocal lens
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Invisible-segment fused bifocal lens
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Kryptok Patent Bifocal
Early-mid 20th c.
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L.V.A. bifocal lens
Sola Pilkington
c.1979-1993
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L.V.A. bifocal lens
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L2CT28 fused bifocal lens
Hoya Lens UK Ltd
20th c.
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Lenticular bifocal lens
20th c.
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Multifield bifocal lens
20th c.
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Nikon-Stigmat ER solid bifocal lens
Nikon
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Norlite S28 bifocal lens
Norville Optical Company Limited
20th c.
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pair of 'Perfex' fused bifocal lenses
Titmus
1959
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Part-manufactured fused bifocal lenses
Late 20th c.
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Part-manufactured solid bifocal lenses
Late 20th c.
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Polycarbonate bifocal lens
20th c.
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Prism-controlled bifocal lens
SB Optical Ltd
1995
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Prism-controlled fused bifocal lens
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Prism-controlled fused bifocal lens
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Progressive Upcurve bifocal lens
Emil Busch AG
20th c.
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R5 and R9 fused bifocal lenses in spectacle frame
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Ribbon-segment fused bifocal lens
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Semi-visible solid downcurve bifocal lens
20th c.
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set of bifocal lenses & case
Link
20th c.
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Set of Sutcliffe cemented bifocal lenses: oval segments
Sutcliffe, Robert
Early 20th c.?
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Sutcliffe Visible solid downcurve bifocal lens (prototype)
Sutcliffe, John Hamer
Post 1901
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Sutcliffe Visible solid downcurve bifocal lens (prototypes)
Sutcliffe, J.H.
c.1901
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Two 'invisible' upcurve solid bifocal lenses
Moussier Boulland & Cie
Post 1849
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Univis (type) fused bifocal lens with compensating prism
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