Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1994-03-30
1996-07-02
Sikes, William L.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351214, 351221, A61B 310
Patent
active
055327729
ABSTRACT:
An ophthalmic apparatus for use by an examiner in examining an examinee's eye includes an optical system for examining the examinee's eye, an observing optical path for observing the examinee's eye directly in binocular vision, a beam splitter disposed in the observing optical path, and a mark forming device for forming an aiming mark at a position conjugate to a predetermined portion of the anterior part of the eye, the light of the aiming mark being reflected by the light splitting member into the eyes of the examiner, wherein the positional relationship along the observing optical path between the anterior part of the examinee's eye and the aiming mark is perceived through the examiner's eyes and the suitability of the working distance of the apparatus can be judged.
REFERENCES:
patent: 5371557 (1994-12-01), Nanjho et al.
Fujieda Masanao
Isogai Naoki
Mimura Yoshiaki
Yano Nobuyuki
Dang Hung Xuan
Nidek Co. Ltd.
Sikes William L.
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