Non-contact type tonometer
First Claim
1. A non-contact type tonometer which deforms a cornea of a subject'"'"'s eye in a non-contact state and measures an intraocular pressure value, comprising:
- a compressed air injector configured to blow air to the cornea of the subject'"'"'s eye along a reference axis to deform the cornea of the subject'"'"'s eye;
a projection optical system configured to project projection light onto the subject'"'"'s eye;
a light receiving optical system configured to receive reflected light which is projected from the projection optical system and reflected on the subject'"'"'s eye;
an alignment unit configured to position the projection optical system and the light receiving optical system by moving the projection optical system and the light receiving optical system relative to the subject'"'"'s eye in the direction of the reference axis, based on a light amount of the reflected light, which is received by the light receiving optical system; and
an intraocular pressure detector configured to detect a deformation of the cornea of the subject'"'"'s eye deformed by the compressed air injector, based on the reflected light amount received by the light receiving optical system,wherein the projection optical system includes a light flux shape regulator which regulates the projection light such that the projection light has a non-circular shape extending in a predetermined direction.
1 Assignment
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Accused Products
Abstract
A non-contact type tonometer includes a air injector for blowing air to a cornea of a subject'"'"'s eye along a reference axis to deform the cornea, a projection optical system for projecting projection light onto the subject'"'"'s eye, a light-receiving optical system for receiving reflected light which is projected from the projection optical system and reflected on the subject'"'"'s eye, an alignment unit for positioning the projection optical system and the light-receiving optical system in the direction of the reference axis based on a light amount of the reflected light which is received by the light-receiving optical system and an intraocular pressure detector for detecting a deformation of the cornea based on the reflected light amount. The projection optical system includes a light flux shape regulator which regulates the projection light such that the projection light has a non-circular shape extending in a predetermined direction.
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Citations
17 Claims
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1. A non-contact type tonometer which deforms a cornea of a subject'"'"'s eye in a non-contact state and measures an intraocular pressure value, comprising:
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a compressed air injector configured to blow air to the cornea of the subject'"'"'s eye along a reference axis to deform the cornea of the subject'"'"'s eye; a projection optical system configured to project projection light onto the subject'"'"'s eye; a light receiving optical system configured to receive reflected light which is projected from the projection optical system and reflected on the subject'"'"'s eye; an alignment unit configured to position the projection optical system and the light receiving optical system by moving the projection optical system and the light receiving optical system relative to the subject'"'"'s eye in the direction of the reference axis, based on a light amount of the reflected light, which is received by the light receiving optical system; and an intraocular pressure detector configured to detect a deformation of the cornea of the subject'"'"'s eye deformed by the compressed air injector, based on the reflected light amount received by the light receiving optical system, wherein the projection optical system includes a light flux shape regulator which regulates the projection light such that the projection light has a non-circular shape extending in a predetermined direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification