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US 8,944,599 B2Granted
Ophthalmologic apparatus, and ophthalmologic control method and program
AssigneeCanon Kabushiki Kaisha
InventorsKoichi Ohta, Toshiaki Okumura
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AssigneeCanon Kabushiki Kaisha
InventorsKoichi Ohta, Toshiaki Okumura
Estimating the term…
An ophthalmologic apparatus, when an output result of an imaging unit provided in an optical path of an imaging optical system satisfies a predetermined condition, stops controlling a driving unit in at least one direction based on a positional relationship of an image of the light flux, which has been reflected by a cornea of the subject's eye and regulated by a light flux regulation unit provided in the optical path of the imaging optical system, and maintains the control of the driving unit in the other directions.
An ophthalmologic apparatus comprising:
A control method for an ophthalmologic apparatus including an acquisition unit configured to acquire information specific to a subject's eye, a driving unit configured to drive the acquisition unit for alignment with the subject's eye, a projection unit configured to project a light flux for alignment onto a cornea of the subject's eye, an anterior eye illumination unit configured to illuminate an anterior eye portion of the subject's eye, an imaging unit configured to image the anterior eye portion of the subject's eye via an imaging optical system, and a light flux regulation unit provided in an optical path of the imaging optical system, the control method comprising:
An ophthalmologic apparatus comprising:
An control method for an ophthalmologic apparatus including an anterior eye illumination unit configured to illuminate an anterior eye portion of a subject's eye, and a light flux regulation unit provided in an optical path of an imaging optical system for imaging the anterior eye portion of the subject's eye, the control method comprising:
An ophthalmologic apparatus comprising:
A control method for an ophthalmologic apparatus including an acquisition unit configured to acquire information specific to a subject's eye, a projection unit configured to project a light flux for alignment onto a cornea of the subject's eye, an anterior eye illumination unit configured to illuminate an anterior eye portion of the subject's eye, a light flux regulation unit configured to regulate a light flux provided in an optical path of an imaging optical system for imaging the anterior eye portion of the subject's eye, and a drive unit configured to drive the acquisition unit with respect to the subject's eye based on a positional relationship of an image of the light flux, which has been reflected by the cornea of the subject's eye and regulated by the light flux regulation unit, the control method comprising:
Dependencies are inferred from the claim text.
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With means for aligning, spacing or blocking spurious reflection ; with means for relaxing: for aligning
Apparatus for testing the eyes; Instruments for examining the eyes: fixation targets for viewing direction
Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions: ophthalmic microscopes
Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions: arrangements specially adapted for…
About 7 years of term left · ends 16 Oct 2033 (estimated)
1. Field of the Invention
The present invention relates to an ophthalmologic apparatus, which acquires information specific to a subject's eye (e.g., eye refractive power, intraocular pressure, and a fundus image), and an ophthalmologic control method and program.
2. Description of the Related Art
FIGS. 1A, 1B, and 1C respectively illustrate an arrangement of an optical system of a measurement unit in an eye refractive power meter according to an exemplary embodiment of the present invention, an anterior eye image to be captured in a first alignment mode, and an anterior eye image to be captured in a second alignment mode.
FIG. 2 is an external view of the eye refractive power meter according to the exemplary embodiment of the present invention.
FIG. 3 is a perspective view of an alignment prism diaphragm according to the exemplary embodiment of the present invention.
If a light receiving amount of an image of a light flux for alignment does not reach a threshold value or if a light receiving amount of noise light other than the image of the light flux reaches the threshold value, the light flux for alignment cannot be detected so that control of a driving unit for alignment in a back-and-forth direction and in up-and-down and right-and-left directions becomes difficult. In such a case, the control of the driving unit for alignment is stopped in the back-and-forth direction, and the alignment is performed by observing an anterior eye image with its depth of focus being shallow in the back-and-forth direction. The control of the driving unit for alignment is maintained based on a positional relationship of the image of the light flux, which has been reflected by a cornea, from an anterior eye illumination unit in the up-and-down and right-and-left directions.
(Apparatus Body)
FIG. 2 illustrates a schematic configuration of an eye refractive power meter serving as an ophthalmologic apparatus according to a first exemplary embodiment of the present invention. A frame 102 is movable in a right-and-left direction (hereinafter referred to as an X-axis direction) with respect to a base 100. An X-axis direction driving mechanism includes an X-axis driving motor 103 fixed on the base 100, a feed screw (not illustrated) connected to an output shaft of the motor 103, and a nut (not illustrated) fixed to the frame 102 while being movable in the X-axis direction on the feed screw. The frame 102 moves in the X-axis direction via the feed screw and the nut by rotation of the motor 103.