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Charles Hymans' upcurve solid bifocal lenses
OPHTHALMIC LENSES
bifocal lens
glass

Pair of glass spectacle lenses removed from a frame. PRO-shape. Upcurve solid bifocals with precisely located optical centres for both distance and near vision. R features an ink dot. L has black ink all around rim. Drilled perforations for frame attachment.


1999.5511

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