Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Reexamination Certificate
2008-03-18
2008-03-18
Harrington, Alicia M (Department: 2873)
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
C351S216000, C351S219000
Reexamination Certificate
active
10862462
ABSTRACT:
An observation apparatus is provided. An apex angle of a contact prism is inputted by operating an apex angle setting knob of a control panel. A fining angle of the contact prism is inputted by operating a fitting angle setting knob. A control unit determines the amount of correction for astigmatism of a left observation optical system and the amount of correction for astigmatism of a right observation optical system based on a recognized observation magnification and the inputted apex angle. An axial angle for the astigmatism of the left observation optical system and an axial angle for the astigmatism of the right observation optical system are determined based on the inputted fitting angle. Variable cross cylinder lens rotating drive units are controlled to rotate cylinder lenses of each of the right and left observation optical systems, thereby obtaining the determined axial angle and the determined amount of correction.
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European Search Report dated Jan. 24, 2005, 3 pages.
Aeba Hidetaka
Fukuma Yasufumi
Kato Yasuo
Nishio Koji
Noda Toru
Edwards Angell Palmer & & Dodge LLP
Harrington Alicia M
Kabushiki Kaisha Topcon
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