Ophthalmologic apparatus and auto-alignment method
First Claim
1. An ophthalmologic apparatus comprising:
- (1) a movable measurement unit which includes a measurement optical system for measuring an eye to be examined;
(2) a first light source which irradiates the eye with first light from a direction different from that of an optical axis of said measurement optical system;
(3) a second light source which irradiates the eye with second light from an optical axis direction of said measurement optical system;
(4) image pickup means for obtaining image information of the eye;
(5) first detection means for detecting a positional relationship between said measurement unit and the eye on the basis of information of the first reflected cornea image formed by said first light source on the basis of image information from said image pickup means; and
(6) second detection means for detecting a positional relationship between said measurement unit and the eye on the basis of information of the second reflected cornea image formed by said second light source on the basis of image information from said image pickup means, wherein said measurement unit is driven to be aligned with the eye on the basis of a detection result formed by said first detection means or second detection means.
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Abstract
An aligning method for an ophthalmologic apparatus including a measurement optical system for measuring the eyes of an object to be examined and an illumination system for illuminating the eyes with extrinsic eye light is disclosed. When a reflected cornea image can be detected by irradiating an eye of the object with alignment light, alignment of the measurement optical system is executed on the basis of the reflected cornea image. If no reflected cornea image of the alignment light can be detected, a reflected cornea image formed by the extrinsic eye light is detected, and alignment of the measurement optical system is executed on the basis of the reflected cornea image formed by the extrinsic eye light. Thereafter, the reflected cornea image is detected again.
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Citations
15 Claims
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1. An ophthalmologic apparatus comprising:
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(1) a movable measurement unit which includes a measurement optical system for measuring an eye to be examined;
(2) a first light source which irradiates the eye with first light from a direction different from that of an optical axis of said measurement optical system;
(3) a second light source which irradiates the eye with second light from an optical axis direction of said measurement optical system;
(4) image pickup means for obtaining image information of the eye;
(5) first detection means for detecting a positional relationship between said measurement unit and the eye on the basis of information of the first reflected cornea image formed by said first light source on the basis of image information from said image pickup means; and
(6) second detection means for detecting a positional relationship between said measurement unit and the eye on the basis of information of the second reflected cornea image formed by said second light source on the basis of image information from said image pickup means, wherein said measurement unit is driven to be aligned with the eye on the basis of a detection result formed by said first detection means or second detection means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An auto-alignment method for an ophthalmologic apparatus including a measurement optical system which measures an eye to be examined, an illumination system which illuminates the eye with extrinsic eye light, and an image pickup device to obtain image information of the eye, comprising:
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(1) the detection step of irradiating the eye with a light beam through the measurement optical system, and detecting a reflected cornea image of the light beam on the basis of the image information;
(2) the aligning step of, when a reflected cornea image can be detected in the detection step, aligning the measurement optical system with the eye on the basis of the reflected cornea image; and
(3) the step of, when no reflected cornea image can be detected in the detection step, detecting a reflected cornea image based on the illumination of extrinsic eye light from the image information, aligning the measurement optical system in accordance with the reflected cornea image, and then performing the detection step again. - View Dependent Claims (9)
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8. An auto-alignment method for an ophthalmologic apparatus including a measurement optical system which measures an eye to be examined, an illumination system which illuminates the eye with extrinsic eye light, and image pickup means for obtaining image information of the eye, comprising:
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(1) the detection step of irradiating the eye with a light beam through the measurement optical system, and detecting a reflected cornea image of the light beam on the basis of the image information from the image pickup means;
(2) the first aligning step of, when a reflected cornea image can be detected in the detection step, aligning the measurement optical system with the eye on the basis of the reflected cornea image;
(3) the second aligning step of, when no reflected cornea image can be detected in the detection step, detecting a pupil image of the eye, aligning the measurement optical system in accordance with the pupil image, and then shifting the detection step; and
(4) the third aligning step of, when the reflected cornea image cannot be detected even after the second aligning step, detecting a reflected cornea image based on the illumination of extrinsic eye light on the basis of image information from the image pickup means, aligning the measurement optical system in accordance with the reflected cornea image, and then shifting to the detection step. - View Dependent Claims (10)
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11. An ophthalmologic apparatus comprising:
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(1) a movable measurement unit which includes a measurement optical system for measuring an eye to be examined;
(2) a light source which irradiates the eye with light from an optical axis of said measurement optical system;
(3) image pickup means for obtaining image information of the eye;
(4) first detection means for detecting a positional relationship between said measurement unit and the eye on the basis of information about a pupil of the eye detected on the basis of image information from said image pickup means; and
(5) second detection means for detecting a positional relationship between said measurement unit and the eye on the basis of information of a reflected cornea image formed by said light source and detected on the basis of the image information from said image pickup means, wherein said measurement unit is driven to be aligned with the eye on the basis of a detection result obtained by said first detection means or second detection means. - View Dependent Claims (12, 13)
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14. An auto-alignment method for an ophthalmologic apparatus including a measurement optical system which measures an eye to be examined, and image pickup means for obtaining image information of the eye, comprising:
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(1) the detection step of irradiating the eye with a light beam through the measurement optical system, and detecting a reflected cornea image of the light beam on the basis of the image information from the image pickup means;
(2) the aligning step of, when a reflected cornea image can be detected in the detection step, aligning the measurement optical system with the eye on the basis of the reflected cornea image; and
(3) the step of, when no reflected cornea image can be detected in the detection step, detecting a pupil image of the eye on the basis of an image signal from the image pickup means, aligning the measurement optical system in accordance with the pupil image, and performing the detection step again.
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15. An auto-alignment method for an ophthalmologic apparatus including a measurement optical system which measures an eye to be examined, and image pickup means for obtaining image information of the eye, comprising:
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(1) the detection step of irradiating the eye with a light beam through the measurement optical system, and detecting a reflected cornea image on the basis of image information from the image pickup means;
(2) the first aligning step of, when a reflected cornea image can be detected in the detection step, aligning the measurement optical system with the eye on the basis of a position of the eye which is discriminated based on the reflected cornea image;
(3) the second aligning step of, when no reflected cornea image can be detected in the detection step, detecting a pupil image of the eye on the basis of image information from the image pickup means, aligning the measurement optical system in accordance with the pupil image, and then shifting to the detection step; and
(4) the third aligning step of, when the reflected cornea image cannot be detected even after the second aligning step, detecting the reflected cornea image on the basis of the image information from the image pickup means, aligning the measurement optical system in accordance with the reflected cornea image, and then shifting the detection step.
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Specification