Ophthalmic apparatus
AssigneeNidek Co., Ltd.
InventorNaoki Isogai
Life of this patent
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Abstract
An ophthalmic apparatus provided with an ophthalmic unit for examination, measurement, or treatment, the unit having a center axis which is aligned with respect to an examinee's eye, is disclosed. This apparatus includes an observation unit through which an image of an anterior part of the examinee's eye is observed; a position detection unit which projects light to the examinee's eye and detects reflection light from the examinee's eye to obtain a position of a center of a cornea or a pupil of the examinee's eye; and a display which displays a graphic mark showing the corneal center or the pupil center with an aiming mark based on a detection result by the position detection means, the marks being superimposed on the anterior part image formed by the observation means.
Claims12
An ophthalmic apparatus provided with an ophthalmic unit for examination, measurement, or treatment, the unit having a center axis which is aligned with respect to an examinee's eye, the apparatus including:
- observation means through which an image of an anterior part of the examinee's eye is observed;
- position detection means which projects light to the examinee's eye and detects reflection light from the examinee's eye to obtain a position of a center of a cornea or a pupil of the examinee's eye;
- and
- display means which displays a graphic mark showing the corneal center or the pupil center with an aiming mark based on a detection result by the position detection means, the marks being superimposed on the anterior part image formed by the observation means.
An ophthalmic apparatus provided with an ophthalmic unit for examination, measurement, or treatment, the unit having a center axis which is aligned with respect to an examinee's eye, the apparatus including:
- observation means through which an image of an anterior part of the examinee's eye is observed, the observation means which includes a photographing optical system which photographs the anterior part and a display which displays the photographed anterior part image;
- position detection means which obtains a position of a center of a cornea of the examinee's eye, the position detection means which includes
- an index projection optical system which projects a first alignment index close to an optical axis of the photographing optical system and a second alignment index far from the optical axis of the photographing optical system onto the cornea of the examinee's eye, and
- an index detection optical system provided with a photoelectric detecting element which detects cornea reflection images of the first and second alignment indexes;
- and
- misalignment detection means which detects an apex of the cornea of the examinee's eye based on a detection result by the index detection optical system to obtain misalignment,
- wherein the index projection optical system projects only the second index during measurement, and the misalignment detection means obtains misalignment during measurement based on a result of detection of the corneal reflection image of the second index.
An ophthalmic apparatus provided with a measurement unit having a measurement optical system, the measurement optical system having a measurement optical axis which is aligned with respect to an examinee's eye, the apparatus including:
- position detection means which obtains a position of a center of a cornea of the examinee's eye, the position detection means which includes
- an index projection optical system which projects a first alignment index close to the measurement optical axis and a second alignment index far from the measurement optical axis onto the cornea of the examinee's eye, and
- an index detection optical system provided with a photoelectric detecting element which detects cornea reflection images of the first and second alignment indexes;
- and
- misalignment detection means which detects an apex of the cornea of the examinee's eye based on a detection result by the index detection optical system to obtain misalignment,
- wherein the index projection optical system projects only the second index during measurement, and the misalignment detection means obtains misalignment during measurement based on a result of detection of the corneal reflection image of the second index.
Dependencies are inferred from the claim text.