Bi-focal spectacle lens
1900
Oval white convex bi-focal spectacle lens, 1845.
1845
Oval white 'Kryptok' fused bi-focal spectacle lens with ground edges
1904
Oval smoke or neutral tint bent glass spectacle lens
Oval pink meniscus convex spectacle lens
Lens, clear glass
1890-1940
Oval amber double concave spectacle lens
Three spectacle lenses.
1900-1930
Oval smoke meniscus convex spectacle lens
Oval blue meniscus concave spectacle lens
Oval white 'new system' deep plano-concave lens.
Oval 'Chlorophylle' parallel glass
Plano-concave cylinder 'chlorophylle' tint
'Strubin' cemented bi-focal spectacle lens
1891
Two bifocal spectacle lenses
1870-1930
Oval blue bent glass spectacle lens, medium tint.
Oval smoke or neutral tint bent glass spectacle lens
Oval smoke or neutral tint
Oval white concave spectacle lens with a grooved edge
Square 'Kryptok' fused slab and segment
Oval blue double concave spectacle lens
Tinted spectacle lenses
1851-1920
Oval blue bent glass spectacle lens, pale tint.
Oval blue bent glass spectacle lens, dark tint.
Round white deep meniscus concave spectacle lens
Oval white double convex spectacle lens
Round white 'Kryptok' tonc bi-focal spectacle lens
Blue plano-cylinder concave spectacle lens
Lens, oval shaped
1890-1940
Lens, oval-shaped, pink-tinted
1890-1950
Optical Trial Case
1911
White plano-convex spectacle lens
1905-1915
Oval white deep double concave spectacle lens
Oval smoke double concave spectacle lens
Oval smoke or neutral tint
Round white 'Kryptok' tonc bi-focal spectacle lens
Oval smoke or neutral tint bent glass spectacle lens
Round white 'lenticular' concave spectacle lens
Square 'Kryptok' fused slab and segment
Oval white double concave spectacle lens
Oval smoke meniscus concave spectacle lens
White plano-concave spectacle lens
1905-1915
Smoke or neutral tint glass for preserver spectacles
Oval spectrum blue parallel glass
Oval white convex spectacle lens with a grooved edge
Bi-focal spectacle lens
1899
Round blue deep double concave spectacle lens with ground edges
Oval white meniscus convex spectacle lens
