OPHTHALMOLOGIC BIOMETRIC OR IMAGE GENERATING SYSTEM AND METHOD FOR DETECTION AND EVALUATION OF MEASURED DATA

• US 20110069279A1
• Filed: 09/20/2010
• Published: 03/24/2011
• Est. Priority Date: 09/18/2009
• Status: Active Grant

• Current Assignee: Carl Zeiss Meditec AG (Carl-Zeiss-Stiftung)
• Original Assignee: Carl Zeiss Meditec AG (Carl-Zeiss-Stiftung)
• Inventors: Ebersbach, Ralf, Bissmann, Wilfried, Pabst, Thomas, Reich, Matthias, Antkowiak, Gerard, Hacker, Martin
• Granted Patent: US 8,388,135 B2
• Time in Patent Office: Days
• US Class Current: 351/221
• CPC Class Codes: A61B 3/102 for optical coherence tomography [OCT]

Abstract

An ophthalmological biometric or image-producing system and method for detection and analysis of measurement data including a measurement arrangement with an illumination unit for illuminating the eye with at least one measurement beam, a signal detection unit for the detection of the light portions scattered or reflected back from the eye, a central control unit with an output unit, and a pattern generating unit which includes an optical scan unit, a control unit as well as a position sensor for measuring the realized deflections of the optical scan unit, whereby control unit, optical scan unit and position sensor can form a control circuit. Thereby, the position sensor, except for the connection within the possible control circuit, includes a connection to a unit of the measurement arrangement for optimizing measurement value logging or to the central control unit for correcting the biometric measurements or tomograms.

Claims

1. An ophthalmological biometric or image-producing system, comprising:

a measurement arrangement with an illumination unit that illuminates the eye with at least one measurement beam;

a signal detection unit that captures light scattered or reflected back from the eye;

a central control unit including an output unit and a central control unit-activated pattern generating unit which includes an optical scan unit, a control unit that controls the optical scan unit'"'"'s deflection of at least one measurement beam with regard to the eye structures;

a position sensor that measures realized deflections of the optical scan unit;

wherein the control unit, the optical scan unit, and the position sensor either form a control loop or do not form a control loop;

wherein the position sensor, in addition to connection within the control loop if the control loop is present, comprises a connection to a unit of the measurement arrangement that optimizes measurement value logging or a connection to the central control unit that corrects the biometric measurements or image data.

2. The ophthalmological biometric or image-producing system, according to claim 1, wherein the signal detection unit that detects the light scattered back from the eye comprises a two-beam interferometer including a measurement arm and wherein the scan unit is positioned in the measurement arm.

3. The ophthalmological biometric or image-producing system, according to claim 1, wherein the position sensor that optimizes the measurement value logging comprises connections to the central control unit, which, varies at least one parameter of the measurement arrangement dependent upon the realized positions of the optical scan unit.

4. The ophthalmological biometric or image-producing system, according to claim 1 wherein the position sensor that optimizes the measurement value logging comprises connections to the central control unit, which varies the pattern generation of the pattern generating unit dependent upon the realized positions of the optical scan unit.

5. The ophthalmological biometric or image-producing system, according to claim 1, wherein the position sensor that optimizes the measurement value logging comprises connections to the central control unit, which varies the control parameters of the control unit dependent upon the realized positions of the optical scan unit.

6. The ophthalmological biometric or image-producing system, according to claim 1, wherein the position sensor that optimizes the measurement value logging comprises a connection to the central control unit, which varies the interference relations in the two-beam interferometer position-dependently dependent upon the realized positions of the optical scan unit.

7. The ophthalmological biometric or image-producing system, according to claim 1, wherein the position sensor that optimizes the measurement value logging is connected to a fixation unit, additionally positioned in the measurement arrangement.

8. The ophthalmological biometric or image-producing system, according to claim 1, wherein the position sensor that optimizes the measurement value logging is connected to the signal detection unit via a trigger unit.

9. The ophthalmological biometric or image-producing system, according to claim 1, wherein the position sensor that optimizes the measurement value logging is connected to the illumination unit via a trigger unit.

10. The ophthalmological biometric or image-producing system, according to claim 1, wherein the position sensor that corrects the biometric measurements or image data comprises connections to the central control unit, which corrects the biometric measurements or image data position-dependently dependent upon the realized positions of the optical scan unit.

11. The ophthalmological biometric or image-producing system, according to claim 1, wherein the position sensor for the correction of the biometric measurements or image data comprises connections to the central control unit which utilizes the transmitted realized deflections of the optical scan unit in connection with the measurements of the signal detection unit to interpolate position-corrected, biometric measurements or image data at positions that are not measured or that are non-measurable.

12. claim 9 The ophthalmological biometric or image-producing system, according to claim 9, wherein the position sensor for the correction of the biometric measurements or image data comprises connections to the central control unit which utilizes the transmitted realized deflections of the optical scan unit in connection with the measurements of the signal detection unit to interpolate position-corrected, biometric measurements or image data at positions that are not measured or that are non-measurable.

13. Ophthalmological biometric or image-producing system, according to claim 1, wherein the position sensor for the correction of the biometric measurements or image data comprises connections to the central control unit which utilizes the transmitted realized deflections of the optical scan unit in connection with the measurements of the signal detection unit to interpolate the position of a vertex of cornea and determine an axis length of the eye therefrom.

14. Ophthalmological biometric or image-producing system, according to claim 10, wherein the position sensor for the correction of the biometric measurements or image data comprises connections to the central control unit which utilizes the transmitted realized deflections of the optical scan unit in connection with the measurements of the signal detection unit to interpolate the position of a vertex of cornea and determine an axis length of the eye therefrom.

15. Ophthalmological biometric or image-producing system, according to claim 11, wherein the position sensor for the correction of the biometric measurements or image data comprises connections to the central control unit which utilizes the transmitted realized deflections of the optical scan unit in connection with the measurements of the signal detection unit to interpolate the position of a vertex of cornea and determine an axis length of the eye therefrom.

16. A computer implemented method of detection and analysis of measurement data of an ophthalmological biometric and image-producing system, comprising

illuminating an eye with at least one measurement beam from an illumination unit in a measurement arrangement, the measurement beam being deflected by an optical scan unit;

detecting light scattered or reflected back from the eye by a signal detection unit and transmitting the scattered or reflected back light to a central control unit with an output unit for processing, analysis, and storage;

controlling the scan unit via a control unit by a central control unit-activated pattern generating unit; and

measuring realized deflections by a position sensor, wherein the control unit, optical scan unit, and position sensor either form a control loop or do not form a control loop;

wherein the position sensor measures the realized positions of the optical scan unit and, in addition to transmission within the control loop if the control loop is present, transmits said positions to a unit of the measurement arrangement for the optimization of the measurement value logging or to the central control unit for corrections of the biometric measurements or image data.

17. The method for detection and analysis of measurement data, according to claim 16, wherein the scan unit is positioned in a measurement arm of a two beam interferometer and further comprising detecting the light scattered back from the eye via the two-beam interferometer.

18. The method for detection and analysis of measurement data, according to claims 16, wherein the position sensor transmits the positional data for the optimization of the measurement value logging to the central control unit, which, dependent on the realized positions of the optical scan unit, varies at least one parameter of the measurement arrangement.

19. The method for detection and analysis of measurement data, according to claim 16, wherein the position sensor transmits the positional data for the optimization of the measurement value logging to the central control unit, which varies the pattern generation of the pattern generating unit dependent upon the realized positions of the optical scan unit.

20. The method for detection and analysis of measurement data, according to claim 16, wherein the position sensor transmits the positional data for the optimization of the measurement value logging to the central control unit, which varies the control parameters of the control unit dependent upon the realized positions of the optical scan unit.

21. The method for detection and analysis of measurement data, according to claim 16, wherein the position sensor transmits the positional data for the optimization of the measurement value logging to the central control unit, which varies the interference relations in the two-beam interferometer position-dependently dependent upon the realized positions of the optical scan unit.

22. The method for detection and analysis of measurement data, according to claim 16, wherein the position sensor transmits the positional data for the optimization of the measurement value logging to a fixation unit, additionally positioned in the measurement arrangement, which controls a fixation marker through positional change.

23. The method for detection and analysis of measurement data, according to claim 16, wherein the position sensor transmits the positional data for the optimization of the measurement value logging to a trigger unit, which position-dependently controls the signal detection unit.

24. The method for detection and analysis of measurement data, according to claim 16, wherein the position sensor transmits the positional data for the optimization of the measurement value logging to a trigger unit, which position-dependently controls the illumination unit.

25. The method for detection and analysis of measurement data, according to claim 16, wherein the position sensor transmits the positional data for the correction of the biometric measurements or image date to the central control unit.

26. The method for detection and analysis of measurement data, according to claim 16, wherein the realized deflections of the optical scan unit, measured by the position sensor and transmitted to the central control unit, are utilized in connection with the measurements of the signal detection unit in order to interpolate position-corrected, biometric measurements or image data at positions not measured or non-measurable.

27. The method for detection and analysis of measurement data, according to claim 16, wherein the central control unit interpolates the position of the vertex of the cornea from the transmitted measurements of the position sensor and the signal detection unit and determines the axis length of the eye therefrom.

28. The method for detection and analysis of measurement data, according to claim 26, wherein the central control unit interpolates the position of the vertex of the cornea from the transmitted measurements of the position sensor and the signal detection unit and determines the axis length of the eye therefrom.