OPTICAL EQUIPMENT FOR OBSERVATION OF THE IRIDOCORNEAL ZONE, METHODS OF MEASURING AND/OR EVALUATING THE IRIDOCORNEAL ZONE

• US 20170231491A1
• Filed: 04/30/2015
• Published: 08/17/2017
• Est. Priority Date: 05/30/2014
• Status: Active Grant

• Current Assignee: Nidek Company Limited
• Original Assignee: Nidek Company Limited
• Inventors: TANASSI, Cesare, BUSCEMI, Phil, CARRARO, Federico, DE GIUSTI, Andrea, MINOZZI, Mattia, PAJARO, Simone, PASCOLINI, Michele, CODOGNO, Nicola
• Granted Patent: US 10,034,606 B2
• Time in Patent Office: Days
• CPC Class Codes: A61B 3/0025 characterised by electronic signal processing, e.g. eye models
• CPC Class Codes: A61B 3/0091 Fixation targets for viewing direction
• CPC Class Codes: A61B 3/117 for examining the anterior chamber or the anterior chamber angle, e.g. gonioscopes
• CPC Class Codes: A61B 3/14 Arrangements specially adapted for eye photography apparatus or arrangements for taking photographs per se G03B

Abstract

An optical equipment suitable for observation of an iridocorneal annular zone of an eye including: an illumination assembly, including at least one illumination electric device for illuminating the zone with a plurality of illumination optical paths for illumination light beams going to a corresponding plurality of sub-portions, an image capturing assembly, including at least one image capturing electric device for capturing images of the zone with a plurality of imaging optical paths for imaging light beams coming from a corresponding plurality of sub-portions, and a front optical assembly having a front surface located close to front surface of an eye, a rear surface located far from front surface of an eye, and including a central portion between the front and rear surfaces and a lateral portion around the central portion; the front optical assembly is stationary; all imaging optical paths pass through central portion between the front and rear surfaces.

Claims

1. Optical equipment suitable for observation of at least a portion of an iridocorneal annular zone of an eye comprising:

an illumination assembly, comprising at least one illumination electric device, for illuminating at least a portion of an iridocorneal annular zone of an eye, and having a plurality of illumination optical paths for one or more illumination light beams going to a corresponding plurality of sub-portions of said portion,

an image capturing assembly, comprising at least one image capturing electric device, for capturing images of at least a portion of an iridocorneal annular zone of an eye, and having a plurality of imaging optical paths for one or more imaging light beams coming from a corresponding plurality of sub-portions of said portion, and

a front optical assembly having a front surface designed to be located close to the front surface of an eye, a rear surface designed to be located far from the front surface of an eye, and comprising a central portion located between the front surface and the rear surface and a lateral portion located around the central portion;

wherein the front optical assembly is stationary;

wherein all the imaging optical paths pass through the central portion between the front surface and the rear surface;

wherein the lateral portion comprises a reflecting element surrounding the central portion and designed to provide a reflection along all the imaging optical paths;

whereby, in use, at least the image capturing assembly is far from the observed eye.

2. Optical equipment according to claim 1,

wherein the front surface of said front optical assembly is designed to be located close at a distance of 0.5-2.5 mm from the front surface of an eye;

wherein the rear surface of said front optical assembly is designed to be located at a distance of 1-4 cm from the front surface of an eye;

wherein, in use, the image capturing assembly is at a distance greater than 2.5 cm from the observed eye.

3. Optical equipment according to claim 1,

wherein all the illumination optical paths pass through the central portion between the front surface and the rear surface, and

wherein the reflecting element is designed to provide a reflection along the illumination optical paths;

whereby, in use, also the illumination assembly is far from the observed eye.

4. Optical equipment according to claim 3,

wherein, in use, the illumination assembly is at a distance greater than 2.5 cm from the observed eye.

5. Optical equipment according to a claim 1, wherein the reflecting element has a reflecting surface facing the central portion, wherein the reflecting surface is shaped like a cylinder lateral surface or a prism lateral surface or a cone lateral surface or a pyramid lateral surface.

6. Optical equipment according to claim 1, wherein the illumination optical paths and/or the imaging optical paths are in infinite number.

7. Optical equipment according to claim 1, wherein the illumination assembly comprises one or more light sources for sending one or more illumination light beams.

8. Optical equipment according to claim 7, comprising further a rear optical assembly, wherein the front optical assembly has a symmetry axis, and wherein the rear optical assembly is adapted to rotate the one or more illumination light beams around said symmetry axis.

9. Optical equipment according to claim 7, wherein the illumination assembly is adapted to send one or more illumination light beams having a predetermined or selectable transversal cross-sectional shape so to create a predetermined or selectable illuminated pattern on a sub-portion of a portion of an iridocorneal annular zone of an eye.

10. Optical equipment according to claim 1, wherein the image capturing assembly comprise one or more image detectors for receiving one or more imaging light beams coming from one or more sub-portions of a portion of an iridocorneal annular zone of an eye.

11. Optical equipment according to claim 10, comprising further a rear optical assembly, wherein the front optical assembly has a symmetry axis, and wherein the rear optical assembly is adapted to rotate the one or more imaging light beams around said symmetry axis.

12. Optical equipment according to claim 1, wherein the image capturing assembly is adapted to focus one or more sub-portions of a portion an iridocorneal annular zone of an eye at different focal planes.

13. Optical equipment according to claim 1, comprising a light emitter for eye fixation.

14. Optical equipment according to claim 1, wherein the front optical assembly is replaceable.

15. Optical equipment according to claim 1, comprising a surgical laser system adapted to send an aiming light beam, wherein at least the front optical assembly is adapted to transmit the aiming light beam.

16. Optical equipment according to claim 1, comprising further an electronic processing unit electrically connected to said image capturing assembly and adapted to process images.

17. Optical equipment according to claim 16, wherein the electronic processing unit is adapted to generate a panoramic rectangular picture of the whole iridocorneal annular zone.

18. Optical equipment according to claim 16, wherein the electronic processing unit is adapted to generate a panoramic annular picture of the whole iridocorneal annular zone.

19. Method of determining an amplitude of an iridocorneal angle at at least one position of an iridocorneal zone of an eye, comprising the steps of:

illuminating the iridocorneal zone at said at least one position through an illumination light beam having a predetermined illuminating pattern, wherein the illumination light beam creates an illuminated pattern covering partially a cornea of the eye and partially an iris of the eye,

capturing an image of the iridocorneal zone at said at least one position including the illuminated pattern,

measuring pattern deform between the illuminating pattern and the illuminated pattern, and

computing the amplitude of an iridocorneal angle based on the pattern deformation.

20. Method of evaluating an iridocorneal angle at at least one position of an iridocorneal zone of an eye, comprising the steps of:

illuminating the iridocorneal zone at said at least one position through an illumination light beam having a predetermined transversal cross-sectional shape, wherein the illumination light beam creates an illuminated pattern covering partially a cornea of the eye and partially an iris of the eye,

capturing an image of the iridocorneal zone at said at least one position including the illuminated pattern, and

processing the captured image of the iridocorneal zone based on the illuminating pattern and illuminated pattern.