Ophthalmic apparatus

An ophthalmic apparatus, comprising:

• an illumination optical system including a slit in which a slit-shaped aperture is formed and an iris aperture in which two apertures are formed at positions away from an optical axis position, the iris aperture being arranged at a position substantially conjugate optically to an iris of a subject's eye between a light source and the slit, and configured to generate slit-shaped illumination light using light from the light source and to guide the illumination light to a fundus of the subject's eye;
• and
• an imaging optical system including an imaging aperture in which an aperture is formed, and configured to guide returning light of the illumination light to an image sensor, the returning light being guided from the fundus by pupil division and passing through the aperture formed in the imaging aperture, wherein
• a width of the slit-shaped aperture, a distance between the two apertures, and a size of the aperture in the imaging aperture are set so that an overlap region of a light flux region of the illumination light and a light flux region of the returning light is located on a side of the fundus from a posterior surface of lens of the subject's eye within the eye of the subject eye, the overlap region being a region in which the illumination light and the returning light intersect,
• the slit-shaped aperture can be arranged at a position substantially conjugate optically to the fundus,
• the aperture in the imaging aperture can be arranged at a position substantially conjugate optically to the iris, and
• when a width of an image of the aperture in the slit on the fundus is represented as Fd, a distance between the two apertures in the iris aperture on the iris is represented as Id, and a size of an image of the aperture in the imaging aperture on the iris is represented as Sd, the following equation is satisfied:
• (Id−Sd)>(Fd/2).

An ophthalmic apparatus, comprising:

• an illumination optical system including a slit in which a slit-shaped aperture is formed and an iris aperture in which two apertures are formed at positions away from an optical axis position, the iris aperture being arranged at a position substantially conjugate optically to an iris of a subject's eye between a light source and the slit, and configured to generate slit-shaped illumination light using light from the light source and to guide the illumination light to a fundus of the subject's eye;
• and
• an imaging optical system including an imaging aperture in which an aperture is formed, and configured to guide returning light of the illumination light to an image sensor, the returning light being guided from the fundus by pupil division and passing through the aperture formed in the imaging aperture, wherein
• a width of the slit-shaped aperture, a distance between the two apertures, and a size of the aperture in the imaging aperture are set so that an overlap region of a light flux region of the illumination light and a light flux region of the returning light is located on a side of the fundus from a posterior surface of lens of the subject's eye within the eye of the subject eye, the overlap region being a region in which the illumination light and the returning light intersect,
• the slit-shaped aperture can be arranged at a position substantially conjugate optically to the fundus,
• the aperture in the imaging aperture can be arranged at a position substantially conjugate optically to the iris, and
• when a width of an image of the aperture in the slit on the fundus is represented as Fd, a distance between the two apertures in the iris aperture on the iris is represented as Id, a size of an image of the aperture in the imaging aperture on the iris is represented as Sd, a distance between a pupil center of the subject's eye and the posterior surface of lens in an optical axis direction of the imaging optical system is represented as LI, a distance between the pupil center and the fundus in the optical axis direction is represented as Lf, a distance between an anterior surface of cornea of the subject's eye and the pupil center in the optical axis direction is represented as La, and the pupil center of the subject's eye is represented as an origin position,
• in case of (La−Ll)×Lf<(2×Ll−Lf)×La, the following equation is satisfied:
• (2×Fd×Ll/(Lf−Ll))<(Id−Sd)<(2×Fd),
• and in case of (La−Ll)×Lf>(2×Ll−Lf)×La, the following equation is satisfied:
• (2×Fd×La/(Lf+La))<(Id−Sd)<(2×Fd).

An ophthalmic apparatus, comprising:

• an illumination optical system including a slit in which a slit-shaped aperture is formed and an iris aperture in which two apertures are formed at positions away from an optical axis position, the iris aperture being arranged at a position substantially conjugate optically to an iris of a subject's eye between a light source and the slit, and configured to generate slit-shaped illumination light using light from the light source and to guide the illumination light to a fundus of the subject's eye;
• and
• an imaging optical system including an imaging aperture in which an aperture is formed, and configured to guide returning light of the illumination light to an image sensor, the returning light being guided from the fundus by pupil division and passing through the aperture formed in the imaging aperture, wherein
• a width of the slit-shaped aperture, a distance between the two apertures, and a size of the aperture in the imaging aperture are set so that an overlap region of a light flux region of the illumination light and a light flux region of the returning light is located on a side of the fundus from a posterior surface of lens of the subject's eye within the eye of the subject eye, the overlap region being a region in which the illumination light and the returning light intersect,
• the slit-shaped aperture can be arranged at a position substantially conjugate optically to the fundus,
• the aperture in the imaging aperture can be arranged at a position substantially conjugate optically to the iris, and
• when a width of an image of the aperture in the slit on the fundus is represented as Fd, a distance between the two apertures in the iris aperture on the iris is represented as Id, a size of an image of the aperture in the imaging aperture on the iris is represented as Sd, and the pupil center of the subject's eye is represented as an origin position, the following equation is satisfied:
• (Fd/2)<(Id−Sd)<(2×Fd).

An ophthalmic apparatus, comprising:

• an illumination optical system including a slit in which a slit-shaped aperture is formed and an iris aperture in which two apertures are formed at positions away from an optical axis position, the iris aperture being arranged at a position substantially conjugate optically to an iris of a subject's eye between a light source and the slit, and configured to generate slit-shaped illumination light using light from the light source and to guide the illumination light to a fundus of the subject's eye;
• and
• an imaging optical system including an imaging aperture in which an aperture is formed, and configured to guide returning light of the illumination light to an image sensor, the returning light being guided from the fundus by pupil division and passing through the aperture formed in the imaging aperture, wherein
• a width of the slit-shaped aperture, a distance between the two apertures, and a size of the aperture in the imaging aperture are set so that an overlap region of a light flux region of the illumination light and a light flux region of the returning light is located on a side of the subject's eye from an anterior surface of cornea of the subject's eye within the eye of the subject eye, the overlap region being a region in which the illumination light and the returning light intersect,
• the slit-shaped aperture can be arranged at a position substantially conjugate optically to the fundus,
• the aperture in the imaging aperture can be arranged at a position substantially conjugate optically to the iris, and
• when a width of an image of the aperture in the slit on the fundus is represented as Fd, a distance between the two apertures in the iris aperture on the iris is represented as Id, a size of an image of the aperture in the imaging aperture on the iris is represented as Sd, a distance between the pupil center and the fundus in the optical axis direction is represented as Lf, a distance between an anterior surface of cornea of the subject's eye and the pupil center in the optical axis direction is represented as La, and the pupil center of the subject's eye is represented as an origin position, the following equation is satisfied:
• (2×Fd×La/(Lf+La)<(Id−Sd)<(2×Fd).

An ophthalmic apparatus, comprising:

• an illumination optical system including a slit in which a slit-shaped aperture is formed and an iris aperture in which two apertures are formed at positions away from an optical axis position, the iris aperture being arranged at a position substantially conjugate optically to an iris of a subject's eye between a light source and the slit, and configured to generate slit-shaped illumination light using light from the light source and to guide the illumination light to a fundus of the subject's eye;
• and
• an imaging optical system including an imaging aperture in which an aperture is formed, and configured to guide returning light of the illumination light to an image sensor, the returning light being guided from the fundus by pupil division and passing through the aperture formed in the imaging aperture, wherein
• a width of the slit-shaped aperture, a distance between the two apertures, and a size of the aperture in the imaging aperture are set so that an overlap region of a light flux region of the illumination light and a light flux region of the returning light is located on a side of the subject's eye from an anterior surface of cornea of the subject's eye within the eye of the subject eye, the overlap region being a region in which the illumination light and the returning light intersect,
• the slit-shaped aperture can be arranged at a position substantially conjugate optically to the fundus,
• the aperture in the imaging aperture can be arranged at a position substantially conjugate optically to the iris, and
• when a width of an image of the aperture in the slit on the fundus is represented as Fd, a distance between the two apertures in the iris aperture on the iris is represented as Id, a size of an image of the aperture in the imaging aperture on the iris is represented as Sd, and the pupil center of the subject's eye is represented as an origin position, the following equation is satisfied;
• (18×Fd/59)<(Id−Sd)<(2×Fd).