MusEYEum Online Catalogue

Welcome to the online catalogue of the British Optical Association Museum. Here you can search for both museum artifacts and archives. Data is transferred from our Collections Management System to this website on a regular basis.


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Kryptok Patent Bifocal
bifocal lens
Europe: United Kingdom
Early-mid 20th c.
case: 20 x 95 x 125 mm

Demonstration sample set (incomplete). Diamond-shaped glass panel with cemented round segment. Separate half round segment. (Oval lens missing). Green leather-covered hinged case with yellow lining.


Ex Keeler Collection

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