Methods and devices for registering optical measurement datasets of an optical system

• US 20040263785A1
• Filed: 06/16/2003
• Published: 12/30/2004
• Est. Priority Date: 06/16/2003
• Status: Active Grant

• Current Assignee: Amo Manufacturing Usa, Llc (Johnson & Johnson)
• Original Assignee: VISX Incorporated
• Inventors: Chernyak, Dimitri
• Granted Patent: US 7,458,683 B2
• Time in Patent Office: Days
• US Class Current: 351/246
• CPC Class Codes: A61B 3/0025 characterised by electronic signal processing, e.g. eye models
• CPC Class Codes: A61B 3/1015 for wavefront analysis

Abstract

The present invention provides methods, systems and software for registering a first dataset of an object with a second dataset of an object. In one embodiment, the present invention measures refractive errors of an optical system. The method comprises obtaining a first and second optical measurement of the optical system. The first and second optical measurements are registered with each other and may improve the diagnosis and/or treatment of the refractive errors of the optical system. In one embodiment the first optical measurement is a topographical map and the second optical measurement is a wavefront measurement.

Claims

1. A method of registering datasets obtained by two different instruments, the method comprising:

obtaining a first dataset from an object with a first instrument;

obtaining a second dataset from the object with a second instrument;

locating distinctive data points of the object in each of the datasets; and

using the distinctive data points to register the first dataset with the second dataset.

2. The method of claim 1 wherein the object is an eye.

3. The method of claim 2 wherein the dataset from the first instrument comprises a wavefront measurement of the eye.

4. The method of claim 2 or 3 wherein the second dataset from the second instrument comprises a corneal topographic map of the eye.

5. The method of claim 2 wherein the distinctive data points are one or more landmarks in the eye.

6. The method of claim 5 wherein the landmarks are at least one of a limbus, iris, iris center, iris pattern, pupil, pupil center, pupil boundary, and corneal vertex.

7. The method of claim 5 wherein the distinctive data point is an iris center, wherein using the distinctive data points to register comprises matching the iris centers of the first data set and the second data set,

the method further comprising scaling at least one of the dataset so that sizes of the first dataset and second data set substantially match each other.

8. The method of claim 2 further comprising generating an ablation pattern for the eye based on an analysis of the first dataset and second dataset.

9. The method of claim 1 further comprising overlaying the first data set and the second data set.

10. The method of claim 9 comprising measuring a cyclotorsional offset between the first dataset and second dataset and compensating for the cyclotorsional offset prior to overlaying the first data set and the second data set.

11. The method of claim 1 wherein using the distinctive data points comprises calculating relative positional and torsional offsets between the first data set and the second data set.

12. The method of claim 11 wherein calculating relative positional and torsional offsets comprises establishing a coordinate system transformation between the first data set and second data set.

13. A method of improving a measurement of refractive errors of an optical system, the method comprising:

obtaining a first optical measurement of the optical system;

obtaining a second measurement of the optical system; and

registering the first optical measurement of the eye with the second measurement of the optical system.

14. The method of claim 13 wherein the optical system comprises optical tissues of an eye,

wherein the first measurement of the optical system is a wavefront measurement of the eye and the second measurement is a corneal topographical map of the eye.

15. The method of claim 14 further comprising diagnosing the optical errors of the eye using the registered corneal topographical map and the wavefront measurement of the eye.

16. The method of claim 14 comprising generating an ablation pattern for the eye by analyzing at least one of the corneal ablation map and the wavefront measurement.

17. The method of claim 14 wherein registering the corneal topographical map of the eye with the wavefront measurement of the eye comprises:

locating landmarks in the corneal topographical map of the eye and the wavefront measurement of the eye;

calculating at least one of a relative positional and torsional offsets between the landmarks to generate a coordinate system transformation between the topographical map and wavefront measurement; and

using the coordinate system transformation to align the corneal topographical map of the eye with the wavefront measurement of the eye.

18. The method of claim 17 wherein the landmark is at least one of a limbus, iris, iris center, iris pattern, pupil, pupil center, pupil boundary, and corneal vortex.

19. The method of claim 14 wherein registering comprises scaling a size of at least one of the corneal topographical map and the wavefront measurement.

20. The method of claim 14 wherein registering comprises overlaying the corneal topographical map of the eye with the wavefront measurement of the eye.

21. A system for registering a first dataset with a second dataset, the system comprising:

a processor;

a memory coupled to the processor, the memory comprising a plurality of modules for registering the first dataset with the second dataset, the modules comprising;

a module for receiving the first dataset;

a module for receiving the second dataset;

a module for locating distinctive data points in each of the datasets; and

a module for using the distinctive data points to register the first dataset with the second dataset.

22. The system of claim 21 wherein the first dataset is a wavefront measurement.

23. The system of claim 21 or 22 wherein the second dataset is a corneal topographical map.

24. The system of claim 21 wherein the system further comprises a corneal topographer that obtains the second dataset.

25. The system of claim 21 wherein the system further comprises a wavefront measurement device that obtains the first dataset.

26. The system of claim 21 wherein the modules further comprise a module for calculating an ablation pattern based on the first dataset and the second dataset.

27. The system of claim 26 further comprising a laser assembly for delivering the ablation pattern.

28. The system of claim 21 wherein the module for using the distinctive data points to register the first dataset with the second dataset is configured to scale a size of at least one of the first dataset and second dataset to substantially match the datasets with each other.

29. The system of claim 21 wherein the distinctive data points are landmarks in an eye.

30. The system of claim 29 wherein the module for locating distinctive data points is configured to locate at least one of a pupil, pupil center, pupil boundary, iris center, iris pattern, iris boundary, limbus, and corneal vertex in the first and second datasets.

31. The system of claim 30 wherein the module for using the distinctive data points is configured to calculate and compensate for a positional and torsional offset between the distinctive data points in the first dataset and second dataset.

32. The system of claim 31 wherein the module for using the distinctive data points is configured to overlay the first dataset with the second dataset.

33. A system for registering a first optical measurement of an optical system with a second optical measurement of the optical system, the system comprising:

a processor;

a memory coupled to the processor, the memory comprising a plurality of modules for registering the first optical measurement with the second optical measurement, the modules comprising;

a module for obtaining the first optical measurement of the optical system;

a module for obtaining the second optical measurement of the optical system; and

a module for registering the first optical measurement of the optical system with the second optical measurement of the optical system.

36. A system for measuring optical errors of an optical system, the system comprising:

means for obtaining a first optical measurement of the optical system;

means for obtaining a second optical measurement of the optical system; and

means for registering the first optical measurement of the optical system with the second optical measurement of the optical system.

34. The system of claim 36 further comprising a module for diagnosing the optical errors of the optical system using the first optical measurement and the second optical measurement of the optical system.

35. The system of claim 37 further comprising a module for generating an ablation pattern to correct the diagnosed optical errors of the optical system.

37. The system of claim 36 further comprising means for diagnosing the optical errors of the optical system using the first optical measurement and the second optical measurement of the optical system.

38. The system of claim 37 further comprising means for correcting the diagnosed optical errors of the optical system.

39. A computer program stored on a computer-readable storage medium for measuring optical errors of an optical system, the computer program comprising:

a code module for receiving the first dataset;

a code module for receiving the second dataset;

a code module for locating distinctive data points in each of the datasets; and

a code module for using the distinctive data points to register the first dataset with the second dataset.

40. The computer program of claim 39 wherein the first dataset is a wavefront measurement.

41. The computer program of claim 39 or 40 wherein the second dataset is a topographical map.

42. The computer program of claim 39 further comprising a code module for diagnosing the optical errors of the optical system.

43. The computer program of claim 42 comprising a code module for generating an ablation pattern to correct the optical errors, wherein the ablation pattern is at least in part based on the diagnosis of the optical errors of the optical system.

44. A computer program stored on a computer-readable storage medium for registering a first optical measurement of an optical system with a second optical measurement of the optical system, the computer program comprising:

a code module for obtaining a first optical measurement of the optical system;

a code module for obtaining a second optical measurement of the optical system; and

a code module for registering the first optical measurement of the optical system with the second optical measurement of the optical system.

45. The computer program of claim 44 further comprising a code module for diagnosing the optical errors of the optical system using the first optical measurement and the second optical measurement of the optical system.

46. The computer program of claim 45 further comprising a code module for generating an ablation pattern to correct the diagnosed optical errors of the optical system.

47. A method of registering a corneal topographic map of an eye that is obtained by a first instrument with a wavefront measurement of an eye that is obtained by a second instrument, the method comprising:

locating landmarks in the corneal topographical map;

locating a corresponding landmark in the wavefront measurement;

determining a relative positional and torsional offset between the landmarks; and

registering the corneal topographical map with the wavefront measurement.

48. The method of claim 47 wherein the landmarks are at least one of a limbus, iris, iris center, iris pattern, pupil, pupil center, pupil boundary, and corneal vertex.

49. The method of claim 47 further comprising overlaying the corneal topographical map with the wavefront measurement.