Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Reexamination Certificate
2007-11-20
2007-11-20
Mai, Huy (Department: 2873)
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
C351S205000, C351S206000
Reexamination Certificate
active
11346382
ABSTRACT:
An ophthalmic measurement apparatus capable of obtaining refractive power containing a skew ray component, and further obtaining wavefront aberration from the refractive power with more ease and higher precision includes an optical system projecting slit light bundles onto a fundus of an examinee's eye and scanning the light bundles in predetermined first and second directions, an optical system with photodetectors placed in positions approximately conjugate with a cornea of the eye and placed in at least one meridian direction orthogonal to an optical axis of the photo-receiving optical system, and an arithmetic part obtaining, based on signals indicating phase differences from one of the photodetectors when photo-receiving the light bundles scanned in the first and second directions, refractive power in two directions at a corneal position corresponding to the photodetector position, and further obtains at least one of refractive power and a wavefront inclination by vector-synthesizing the obtained refractive power.
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Ban Yukinobu
Fujieda Masanao
Mai Huy
Nidek Co. Ltd.
Oliff & Berridg,e PLC
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