JP2009291516A5 - - Google Patents

Claims (13)

An ophthalmic examination apparatus for examining an arbitrary position in an anterior segment of an eye to be examined,
Inspection optical system for eye examination;
Normal direction calculation means for determining the direction of the normal at the arbitrary position using a predetermined radius of curvature of the cornea of the human eye;
By this test at least inclined of inclined and linear movement of the optical reference axis of the optical system, the direction of the optical reference axis, and the optical reference axis positioning mechanism for along the normal direction of the arbitrary position on the corneal surface of the eye An ophthalmic examination apparatus. An anterior ocular segment observation optical system having a camera that images the anterior ocular segment of the eye to be examined;
And a position specifying means for specifying a test portion on the anterior segment image captured by the anterior segment observation optical system,
The normal direction calculation means calculates the normal direction of the position designated by the position designation means, the corneal apex position on the anterior eye image captured by the anterior eye observation optical system, and the designated position. The ophthalmic examination apparatus according to claim 1, wherein the ophthalmic examination apparatus is configured to perform calculation based on the relative positional relationship between A position specifying means for specifying the test part on the anterior eye image is provided,
This anterior ocular segment image is a standard size anterior segment image having a predetermined corneal curvature radius, and is an image stored in this ophthalmic examination apparatus,
The normal direction calculating means calculates the normal direction of the position specified by the position specifying means based on the relative positional relationship between the corneal vertex position on the anterior segment image and the specified position. The ophthalmic examination apparatus according to claim 1, which is configured as follows. The anterior segment image is divided into a plurality of predetermined areas, and a representative position is determined in each area;
The ophthalmic examination apparatus according to claim 2 or 3, wherein when the position specifying means specifies a position, the representative position of an area to which the specified position belongs is specified. The coordinates are set on the anterior segment image,
The ophthalmic examination apparatus according to claim 2 or 3, wherein the position designation unit is configured to designate a position on the anterior ocular segment image by inputting a coordinate value corresponding to the designated position. An ophthalmic examination apparatus for examining an arbitrary position in an anterior segment of an eye to be examined,
Inspection optical system for eye examination;
An optical reference axis positioning mechanism that aligns the direction of the optical reference axis with the normal of the arbitrary position on the corneal surface of the eye to be examined by tilting at least one of the tilt and linear movement of the optical reference axis of the inspection optical system. And
Using the predetermined radius of curvature of the cornea of the human eye, normal data is calculated by calculating a plurality of predetermined points on the predetermined anterior segment image and the direction of the normal on the cornea at the predetermined points. are stored as, by designating by selecting the predetermined point, the normal direction is determined at a specified position, the inspection apparatus for ophthalmology. The inspection optical system is
An illumination optical system for illuminating the anterior segment of the subject's eye from the diagonally front with illumination light;
A photographing optical system for receiving reflected light reflected by the anterior segment of the illumination light;
The optical reference axis, the a axis bisecting the intersection angle of the photographing optical axis of the illumination optical axis of the imaging optical system of the illumination optical system, according to any one of of the preceding claims 1 to 6 Ophthalmic examination equipment. The optical reference axis positioning mechanism forms a right angle with each other, including a first mechanism for tilting the optical reference axis in a plane, a second mechanism for tilting in a plane perpendicular to the plane, and a direction toward the eye to be examined. The ophthalmic examination apparatus according to any one of claims 1 to 7 , further comprising a third mechanism that advances and retracts in each of the three axial directions. An anterior ocular segment observation optical system having a camera that images the anterior ocular segment of the eye to be examined;
An alignment index projection optical system that irradiates the eye to be examined with alignment index light along the observation optical axis of the anterior ocular segment observation optical system,
The anterior ocular segment observation optical system is configured to detect the corneal apex position of the anterior ocular segment when the camera receives a reflected image from the eye surface of the alignment index light,
9. The ophthalmic apparatus according to claim 8 , wherein the third optical mechanism is configured to perform alignment of the inspection optical system with respect to the eye to be examined by moving the reflected image so as to fall within a predetermined range of the imaging screen of the camera. Inspection device. A position fixing unit for fixing the eye to be examined at a predetermined position;
The first mechanism is configured to tilt the inspection optical system with a point set so as to substantially correspond to the center point of the anterior segment spherical surface of the eye to be examined in the position fixing unit,
10. The ophthalmic examination apparatus according to claim 8 , wherein the second mechanism includes a tiltable reflecting member for reflecting the optical reference axis to bend its direction. A position fixing unit for fixing the eye to be examined at a predetermined position;
The first mechanism is configured to tilt the inspection optical system with a point set so as to substantially correspond to the center point of the anterior segment spherical surface of the eye to be examined in the position fixing unit,
The second mechanism is configured to tilt the inspection optical system with a point set so as to substantially correspond to the center point of the anterior surface spherical surface of the eye to be examined in the position fixing unit. The ophthalmic examination apparatus according to claim 8 or 9 . A fixation target for keeping the direction of the eye to be examined in a single direction by fixing the eye to be examined is provided in a fixed and immovable state, and the reflecting member reflects a part of the light and transmits a part of the light. Composed of a translucent mirror member,
Since the fixation target is disposed behind the translucent mirror member when viewed from the eye to be inspected at the position fixing portion, the fixation eye passes through the translucent mirror member and fixes the fixation target. The ophthalmic examination apparatus according to claim 10 , which can be viewed. The anterior ocular segment observation optical system is provided in an immovable fixed state, and the anterior ocular segment observation optical system is disposed behind the translucent mirror member as viewed from the eye to be examined in the position fixing unit. The optical axis of the anterior ocular segment observation optical system is configured so as to be along the axis from the eye to the fixation target between the translucent mirror member and the eye to be examined in the position fixing unit. The ophthalmic examination apparatus according to claim 12 .