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Article
August 1951

A MODIFIED CROSS CYLINDER

AMA Arch Ophthalmol. 1951;46(2):153-154. doi:10.1001/archopht.1951.01700020159005
Abstract

SINCE the advent of Jackson's cross cylinder in 1887, many modifications have been suggested and used. Among these have been a rotating cross cylinder for use in a trial frame, by Hornbogen1; a cross cylinder with additional markings for

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