Ophthalmic apparatus having an intraocular pressure measuring system

• US 5,523,808 A
• Filed: 11/10/1994
• Issued: 06/04/1996
• Est. Priority Date: 01/08/1992
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kohayakawa, Yoshimi
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Dang, Hung Xuan
• Application Number:
  US08/337,143
• Time in Patent Office: 572 Days
• Field of Search: 351/209, 351/210, 351/211, 351/212, 351/247, 128/645, 128/648, 128/652, 354/62
• US Class Current: 351/210
• CPC Class Codes: A61B 3/145 by video means
• CPC Class Codes: A61B 3/165 Non-contacting tonometers
• CPC Class Codes: A61B 3/18 Arrangement of plural eye-testing or -examining apparatus

Abstract

A composite ophthalmic apparatus includes an intraocular pressure measuring system for spraying a fluid from a nozzle against an eye to be examined to deform its cornea and detecting a deformation amount of the cornea to measure the intraocular pressure of the eye, and another ophthalmic optical system. The apparatus is provided with a system for displacing the nozzle or the ophthalmic optical system relative to an eye to be examined so as to allow the center of the nozzle or the optical axis of the ophthalmic optical system to agree with the visual axis of the eye to be examined.

Claims

1. An ophthalmological apparatus comprising:

an anterior eye observing system having an observation optical system for displaying an anterior part of an eye to be examined;

an intraocular pressure measuring system, having a pressurizing system for spraying a fluid against the eye to be examined and a deformation detecting system for detecting deformation of the eye to be examined caused by said pressurizing system, for measuring an intraocular pressure of the eye to be examined in accordance with the detection result of said deformation detecting system, said pressurizing system having a nozzle for fluid spraying at a position opposite to the eye to be examined; and

an eye examining system for examining the eye to be examined by performing an operation other than the measuring of the intraocular pressure by receiving light from the eye to be examined via an examination optical system, said examination optical system and said observation optical system having a common optical axis in at least an objective unit,

wherein said nozzle is arranged outside the common optical axis of said objective unit when eye examination is performed by said eye examining system.

2. An apparatus according to claim 1, wherein said eye examining system performs eye fundus photographing as the examination of the eye to be examined.

3. An apparatus according to claim 1, wherein said eye examining system performs measurement of an eye refraction as the examination of the eye to be examined.

4. An apparatus according to claim 1, wherein said nozzle is fixed at a position apart from the common optical axis of said objective unit so as to spray a fluid against the eye to be examined in a direction oblique to the common optical axis.

5. An apparatus according to claim 1, wherein said nozzle is fixed to said objective unit by a holding member, said holding member being set inclined with respect to the common optical axis of said objective unit.

6. An ophthalmological apparatus comprising:

an anterior eye observing system having an observation optical system for displaying an anterior part of an eye to be examined;

an eye examining system for executing an examination of the eye to be examined by receiving light from the eye to be examined via an examination optical system, said examination optical system and said observation optical system having a common optical axis in at least an objective unit; and

an intraocular pressure measuring system, having a pressurizing system for spraying a fluid against the eye to be examined and a deformation detecting system for detecting deformation of the eye to be examined caused by said pressurizing system, for measuring an intraocular pressure of the eye to be examined in accordance with the detection result of said deformation detecting system, said pressurizing system having a nozzle for fluid spraying at a position opposite to the eye to be examined,

wherein said nozzle is arranged outside the common optical axis of said objective unit when eye examination is performed by said eye examining system,

wherein said nozzle is so arranged as to be inserted into or removed from the common optical axis of said objective unit.

7. An ophthalmological apparatus, comprising:

an anterior eye observing system having an observation optical system for displaying an anterior part of an eye to be examined;

an eye examining system for executing an examination of the eye to be examined by receiving light from the eye to be examined via an examination optical system, said examination optical system and said observation optical system having a common optical axis in at least an objective unit;

an intraocular pressure measuring system, having a pressurizing system for spraying a fluid against the eye to be examined and a deformation detecting system for detecting deformation of the eye to be examined caused by said pressurizing system, for measuring an intraocular pressure of the eye to be examined in accordance with the detection result of said deformation detecting system, said pressurizing system having a nozzle for fluid spraying at a position opposite to the eye to be examined,

wherein said nozzle is arranged outside the common optical axis of said objective unit when eye examination is performed by said eye examining system; and

a housing for containing said intraocular pressure measuring system, said housing being movable between the eye to be examined and said objective unit.

8. An ophthalmological apparatus comprising:

an anterior eye observing system having an observation optical system for displaying an anterior part of an eye to be examined;

an eye examining system for executing an examination of the eye to be examined by receiving light from the eye to be examined via an examination optical system, said examination optical system and said observation optical system having a common optical axis in at least an objective unit; and

an intraocular pressure measuring system, having a pressurizing system for spraying a fluid against the eye to be examined and a deformation detecting system for detecting deformation of the eye to be examined caused by said pressurizing system, for measuring an intraocular pressure of the eye to be examined in accordance with the detection result of said deformation detecting system, said pressurizing system having a nozzle for fluid spraying at a position opposite to the eye to be examined,

wherein said nozzle is arranged outside the common optical axis of said objective unit when eye examination is performed by said eye examining system,

wherein said nozzle is fixed at a position apart from the common optical axis of said objective unit and at a position opposite to a top of a cornea of the eye to be examined when intraocular pressure measurement is performed by said intraocular pressure measuring system.

9. An ophthalmological apparatus, comprising:

an anterior eye observing system having an observation optical system for displaying an anterior part of an eye to be examined;

an eye examining system for executing an examination of the eye to be examined by receiving light from the eye to be examined via an examination optical system, said examination optical system and said observation optical system having a common optical axis in at least an objective unit; and

an intraocular pressure measuring system, having a pressurizing system for spraying a fluid against the eye to be examined and a deformation detecting system for detecting deformation of the eye to be examined caused by said pressurizing system, for measuring an intraocular pressure of the eye to be examined in accordance with the detection result of said deformation detecting system, said pressurizing system having a nozzle for fluid spraying at a position opposite to the eye to be examined,

wherein said nozzle is arranged outside the common optical axis of said objective unit when eye examination is performed by said eye examining system,

wherein said examination optical system has a pivot mirror provided at a position farther from the eye to be examined than said objective unit so as to be inserted into or removed from said examination optical system, and said deformation detecting system detects deformation of the eye to be examined via said pivot mirror when said pivot mirror is inserted into said examination optical system.

10. An apparatus according to claim 9, wherein said anterior eye observing system displays an anterior eye via said pivot mirror when said pivot mirror is inserted into said examination optical system.

11. An ophthalmological apparatus comprising:

an intraocular pressure measuring system, having a pressurizing system for spraying a fluid against the eye to be examined and a deformation detecting system for photoelectrically detecting deformation of the eye to be examined caused by said pressurizing system, for measuring an intraocular pressure of the eye to be examined in accordance with the detection result of said deformation detecting system, said pressurizing system having a nozzle for fluid spraying at a position opposite to the eye to be examined, and

an eye examining system for examining the eye to be examined by performing an operation other than the measuring of the intraocular pressure by receiving light from the eye to be examined via an examination optical system,

wherein said nozzle sprays a fluid against the eye to be examined from a position apart from an optical axis of said examination optical system and in a direction oblique to the optical axis of said examination optical system and perpendicular to a cornea of the eye to be examined.

12. An apparatus according to claim 11, wherein said eye examining system performs eye fundus photographing as the examination of the eye to be examined.

13. An apparatus according to claim 11, wherein said eye examining system performs eye refraction measurement as the examination of the eye to be examined.

14. A tonometer comprising:

a pressurizing system for spraying a fluid against an eye to be examined; and

a deformation detecting system for photoelectrically detecting deformation of the eye to be examined caused by said pressurizing system, an intraocular pressure of the eye to be examined being measured in accordance with the detection result of said deformation detecting system,

wherein said pressurizing system has a nozzle for fluid spraying at a position opposite to the eye to be examined, said nozzle spraying a fluid against a position except at the top of a cornea of the eye to be examined in a direction substantially perpendicular to a cornea of the eye to be examined.