Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1980-11-05
1983-10-11
Evans, F. L.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351214, A61B 310
Patent
active
044088477
ABSTRACT:
A refractory power measuring device for measuring the refractory power of the human eye or a lens. The device includes a target projecting optical system having two optical elements which are movable along the optical axis of the system independently from each other. The device can measure simultaneously the refractory powers along two astigmatic axes.
REFERENCES:
patent: 3664631 (1972-05-01), Guyton
patent: 3669530 (1972-06-01), Guyton
patent: 4293199 (1981-10-01), Wada et al.
Ishihara Taketoshi
Kato Yasuo
Kitao Ikuo
Oana Yoshinori
Wada Shinji
Evans F. L.
Tokyo Kogaku Kikai Kabushiki Kaisha
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