Eye examining or testing instrument > Subjective type > Lens or filter selectively insertable in optical path > Movable along optical axis > Patents

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Class Information
Number: 351/236
Name: Optics: eye examining, vision testing and correcting > Eye examining or testing instrument > Subjective type > Lens or filter selectively insertable in optical path > Movable along optical axis
Description: Subject matter wherein individual trial lenses or optical systems comprising plural superimposed adjustable lenses are movable along the optical axis before the eyes of a patient in a plane vertical to the direction of sight.

Patents under this class:

Patent Number	Title Of Patent	Date Issued
6733128	Microscope for noncontact wide-angle viewing	May. 11, 2004
5568188	Video attachment to a microscope	Oct. 22, 1996
5455645	Refractometer for measuring spherical refractive errors	Oct. 3, 1995
5420651	Refraction device for the subjective determination of the spherical and astigmatic sight properties of the eye	May. 30, 1995
4299455	Vision testing instrument	Nov. 10, 1981
4243304	Convergence mechanism for binocular refracting instrument	Jan. 6, 1981