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Class Information
Number: 351/228
Name: Optics: eye examining, vision testing and correcting > Eye examining or testing instrument > Subjective type > Including trial frame > With multifocal lens
Description: Subject matter including structure for selecting near and far vision portions of multifocal lenses, demonstrating optical characteristics of multifocal lens segments, and for properly locating the segments relative to the basic lens and the eyes of the patient.

Patents under this class:

Patent Number	Title Of Patent	Date Issued
7533993	Method and apparatus for correcting vision using an electro-active phoropter	May. 19, 2009
7455403	Simultaneous vision emulation for fitting of corrective multifocal contact lenses	Nov. 25, 2008
7334894	Temporal vision modification	Feb. 26, 2008
7264354	Method and apparatus for correcting vision using an electro-active phoropter	Sep. 4, 2007
7131727	Simultaneous vision emulation for fitting of corrective multifocal contact lenses	Nov. 7, 2006
6491394	Method for refracting and dispensing electro-active spectacles	Dec. 10, 2002
5677751	Decals for multifocals	Oct. 14, 1997
4505043	Height measurement gage for multifocal lenses	Mar. 19, 1985