Oval white 'new system' deep plano-concave lens.

Optics

Lens, circular, blue-tinted glass

Ophthalmology

1880-1930

Lens, oval, flat

Ophthalmology

1890-1940

Collection of spectacle lenses

Optics

Pair of variform spectacle lenses

Optics

1990-1995

Round white 'Kryptok' tonc bi-focal spectacle lens

Optics

Oval white double concave spectacle lens

Optics

Oval white concave spectacle lens with a grooved edge

Optics

Oval white convex spectacle lens with bevelled edge for frame

Optics

Oval white double convex pebble spectacle lens with a grooved edge

Optics

Oval blue meniscus convex spectacle lens

Optics

Oval white meniscus concave spectacle lens

Optics

Oval white deep double concave spectacle lens

Optics

Oval smoke or neutral tint bent glass spectacle lens

Optics

White oval Bright's patent bi-focal spectacle lens with triangular segment

Optics

1912

Square 'Kryptok' fused slab and segment

Optics

Oval 'Chlorophylle' bent glass spectacle lens

Optics

Oval smoke or neutral tint

Optics

Oval 'Chlorophylle' parallel glass

Optics

Blue plano-cylinder concave spectacle lens

Optics

White concave spectacle lens

Optics

Blue spherical- cylinder concave spectacle lens

Optics

Smoke plano-cylinder concave spectacle lens

Optics

Seven tinted sunglass lenses, English, 1880-1940

Ophthalmology

1880-1940

Collection of eight spectacle lenses in original packing

Ophthalmology

1955-1975

Two bifocal spectacle lenses

Ophthalmology

1870-1930

Oval blue bent glass spectacle lens, pale tint.

Optics

Round white 'Kryptok' tonc bi-focal spectacle lens

Optics

Oval white meniscus convex spectacle lens

Optics

Oval amber double concave spectacle lens

Optics

Oval white meniscus convex pebble spectacle lens

Optics

Oval pink meniscus convex spectacle lens

Optics

Oval white meniscus concave pebble spectacle lens

Optics

Oval white double concave pebble spectacle lens

Optics

Oval smoke or neutral tint bent glass spectacle lens

Optics

Square 'Kryptok' fused slab and segment

Optics

Oval smoke or neutral tint bent glass spectacle lens

Optics

D-shaped green tint glass for preservers spectacles

Optics

Smoke spherical-cylinder convex spectacle lens

Optics

Smoke or neutral tint glass for preserver spectacles

Optics

Lens, roughly cut oval shape

Ophthalmology

1840-1940

Lens, oval-shaped, pink-tinted

Ophthalmology

1890-1950

White plano-concave spectacle lens

Optics

1905-1915

Two bifocal spectacles lenses

Ophthalmology

1901-1930

Oval neutral or smoke parallel glass for preserver

Optics

Oval blue bent glass spectacle lens, bright tint.

Optics

Oval white bent glass for protectors spectacles.

Optics

Oval blue bent glass spectacle lens, medium tint.

Optics

Bi-focal spectacle lens

Optics

1899

Oval smoke double concave spectacle lens

Optics