The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 16, 1985
Filed:
May. 28, 1982
Masao Nohda, Yokosuka, JP;
Nippon Kogaku K. K., , JP;
Abstract
An apparatus for subjectively measuring the refractive power of an eye includes obliquely disposed beam splitter means, diaphragm means provided on the reflection optical axis of the beam splitter means and having a pair of openings symmetric with the reflection optical axis, collimation mark means provided on the reflection optical axis of the beam splitter means and on the side opposite to the beam splitter means, first imaging lens means provided between the beam splitter means and the diaphragm means, second imaging lens means provided between the diaphragm means and the collimation mark means, rotating means for rotating an image of the openings of the diaphragm means about the reflection optical axis, means for varying the optical distance of the collimation mark means relative to the diaphragm means, first converter means for causing the angle of rotation of the rotating means to correspond to the direction of the astigmatism axis, and second converter means for causing the optical distance between the diaphragm means and the collimation mark means to correspond to the refractive power.