Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Reexamination Certificate
2004-12-17
2008-03-11
Mai, Huy K (Department: 2873)
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
C351S211000
Reexamination Certificate
active
07341346
ABSTRACT:
An ocular accommodative function examination apparatus for examining an accommodative function of an examinee's eye, comprises: a fixation target presenting optical system which presents a fixation target at a presenting position to the eye, the presenting position being changeable in a direction of a visual axis of the eye; a refractive power measuring optical system which measures refractive power of the eye and includes a light projecting optical system which includes a light source and projects examination light to a fundus of the eye and a light receiving optical system which includes a light receiving element and receives the examination light reflected from the fundus; an analysis part which acquires variation or fluctuation in the refractive power in a specified measurement meridian direction of the eye gazing at the fixation target at a certain presenting position within a predetermined time based on output of the light receiving element, and determines the accommodative function of the eye based on the acquired variation or fluctuation; an output part which outputs a result determined by the analysis part; and a correcting device which corrects the refractive power determined in the specified measurement meridian direction based on astigmatic power and an astigmatic axis angle when the eye has astigmatism; wherein the analysis part determines the accommodative function based on the corrected refractive power.
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Setsuko Suzuki et al.; “Evaluation of Accommodative Function by High Frequency Component of Accommodative Microfluctuation”; pp. 93-97; Visual Science, vol. 22 No. 3; Sep. 2001.
Hanaki Miwako
Isogai Naoki
Kawai Noriji
Mai Huy K
Nidek Co. Ltd.
Oliff & Berridg,e PLC
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