US20080218692A1 - Reflectometry/Interferometry System and Method for Corneal Plane Positioning - Google Patents
Reflectometry/Interferometry System and Method for Corneal Plane Positioning Download PDFInfo
- Publication number
- US20080218692A1 US20080218692A1 US11/682,608 US68260807A US2008218692A1 US 20080218692 A1 US20080218692 A1 US 20080218692A1 US 68260807 A US68260807 A US 68260807A US 2008218692 A1 US2008218692 A1 US 2008218692A1
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- United States
- Prior art keywords
- patient
- anterior surface
- desired position
- moving
- eye
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/007—Methods or devices for eye surgery
- A61F9/008—Methods or devices for eye surgery using laser
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/102—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for optical coherence tomography [OCT]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/14—Arrangements specially adapted for eye photography
- A61B3/15—Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection ; with means for relaxing
- A61B3/152—Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection ; with means for relaxing for aligning
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/1005—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for measuring distances inside the eye, e.g. thickness of the cornea
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/107—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for determining the shape or measuring the curvature of the cornea
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/007—Methods or devices for eye surgery
- A61F9/008—Methods or devices for eye surgery using laser
- A61F2009/00844—Feedback systems
- A61F2009/00846—Eyetracking
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Surgery (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Veterinary Medicine (AREA)
- Public Health (AREA)
- Animal Behavior & Ethology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Biophysics (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Optics & Photonics (AREA)
- Vascular Medicine (AREA)
- Radiology & Medical Imaging (AREA)
- Eye Examination Apparatus (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Dental Preparations (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
A system for positioning an eye of a patient, for example, for laser ophthalmic surgery includes a reflectometer adapted to receive as input a reflected beam from an anterior surface of a cornea of an eye of a patient. The interferometer is calibratable to a desired position of the corneal anterior surface. A comparator is in signal communication with the interferometer and is adapted to calculate from the input a difference between an actual position and the desired position of the corneal anterior surface. A device is in signal communication with the comparator for moving the patient a distance in a direction for matching the actual position to the desired position of the corneal anterior surface.
Description
- The present invention is directed to patient positioning systems for ophthalmic laser surgery systems, and, in particular, to such systems using reflectometry/interferometry.
- Precise positioning of a patient's eye is critical for successful outcomes in ophthalmic laser systems. At present such positioning is performed by optimizing the focus of a video image of the patient's eye. Typically such focusing is performed by the surgeon, and can be accurate to the millimeter level.
- Therefore, it would be advantageous to provide a system and method that could improve the accuracy of positioning a patient's cornea for ophthalmic surgery, and that could be performed automatically.
- The present invention is directed to a system for positioning an eye of a patient, for example, for laser ophthalmic surgery. The system comprises a reflectometer adapted to receive as input a reflected beam from an anterior surface of a cornea of an eye of a patient. The interferometer is calibratable to a desired position of the corneal anterior surface.
- A comparator is in signal communication with the interferometer and is adapted to calculate from the input a difference between an actual position and the desired position of the corneal anterior surface. A device is in signal communication with the comparator for moving the patient a distance in a direction for matching the actual position to the desired position of the corneal anterior surface.
- A method for positioning an eye of a patient comprises the steps of receiving a reflected beam from an anterior surface of a cornea of an eye of a patient. The received reflected beam is compared with a reference beam calibrated to a desired position of the corneal anterior surface. A difference between an actual position and the desired position of the corneal anterior surface is calculated from the comparing step. Then the patient is moved a distance in a direction for matching the actual position to the desired position of the corneal anterior surface.
-
FIG. 1 illustrates reflections from various structures of the eye. -
FIG. 2 is a schematic diagram of an exemplary embodiment of the eye positioning system of the present invention. -
FIG. 3 is a more detailed view of an embodiment of the reflectometer/interferometer. - A description of preferred embodiments of the invention will now be presented with reference to
FIGS. 1-3 . - The eye 10 (
FIG. 1 ) contains several structures that can reflect light. Depending upon the wavelength and intensity of incoming radiation, reflections 11-15 can be detected, respectively, from the anterior 16 and posterior 17 surfaces of thecornea 18, the anterior 19 and posterior 20 surfaces of thelens 21, andanterior surface 22 of theretina 23. If a broad-bandwidth source is used,reflections 11 from the cornea'santerior surface 16 can be obtained with virtually no contribution from the other reflections 12-15. - A high-level schematic diagram of a
system 30 for precisely determining a position of a patient'seye 10 is given inFIG. 2 , wherein an excimerlaser delivery subsystem 31 is configured to deliver abeam 32 of ablating radiation to theeye 10 after impinging upon a beam combiner 33 and adjusted bygalvo scan mirrors 29. It will be understood by one of skill in the art that thissubsystem 31 is intended to be exemplary, and that thepositioning system 30 of the present invention can be used with other subsystems as well. - A
source 34, for example, a broad-bandwidth light source, within a reflectometer/interferometer system 35 emits abeam 36 to the beam combiner 33 and thence to theeye 10. - A
reflected beam 11 from the eye's anteriorcorneal surface 16 travels back through the beam combiner 33 to the reflectometer/interferometer 35, where it is compared with a reference beam to determine whether theeye 10, specifically, thecorneal plane 16, is positioned at a predetermined position for theexcimer laser system 31. Data are output to aprocessor 38 havingsoftware 39 resident thereon to adjust the patient's position, for example, by way of a chair ortable position controller 40. Thesystem 30 can act in closed-loop configuration to continue measuring and adjusting until the predetermined position is reached. - A detailed view of an exemplary configuration for a reflectometer/
interferometer system 35 for use with the present invention is shown inFIG. 3 , wherein thesource 34 enters a coupler/beamsplitter 41. Thesystem 35 will have been calibrated so that thescanning cube 42 has as a center of its scan range is as near to the optimum corneal apex plane as possible.Light 11 reflected from the patient's anteriorcorneal surface 16 interferes with a reference signal at or near the middle of the scan range of the reference path. This arrangement will give a sensitivity in the range of λ/4, in the micrometer range. - In use, the patient is nominally positioned, and an auto-z feedback loop can be established wherein the
front surface signal 11 is used to position the patient chair ortable using controller 40. - One of skill in the art will recognize that other configurations for the reflectometer/interferometer could be used without departing from the spirit of the invention.
- In the foregoing description, certain terms have been used for brevity, clarity, and understanding, but no unnecessary limitations are to be implied therefrom beyond the requirements of the prior art, because such words are used for description purposes herein and are intended to be broadly construed. Moreover, the embodiments of the system illustrated and described herein are by way of example, and the scope of the invention is not limited to the exact details of construction.
- Having now described the invention, the construction, the operation and use of preferred embodiments thereof, and the advantageous new and useful results obtained thereby, the new and useful constructions, and reasonable mechanical and optical equivalents thereof obvious to those skilled in the art, are set forth in the appended claims.
Claims (12)
1. A system for positioning an eye of a patient comprising:
a reflectometer adapted to receive as input a reflected beam from an anterior surface of a cornea of an eye of a patient, the interferometer calibratable to a desired position of the corneal anterior surface;
a comparator in signal communication with the interferometer and adapted to calculate from the input a difference between an actual position and the desired position of the corneal anterior surface; and
a device in signal communication with the comparator for moving the patient a distance in a direction for matching the actual position to the desired position of the corneal anterior surface.
2. The system recited in claim 1 , wherein the reflectometer comprises an optical low-coherence interferometer.
3. The system recited in claim 1 , wherein the reflectometer comprises a broad-bandwidth light source.
4. The system recited in claim 1 , wherein the patient-moving device comprises means for moving a patient support element the distance to achieve the desired position.
5. The system recited in claim 1 , wherein the reflectometer and the patient-moving device are connected in a closed-loop feedback configuration.
6. The system recited in claim 1 , wherein the comparator comprises a processor having software resident thereon for calculating from the input a signal for being communicated to the patient-moving device to achieve the desired position.
7. A method for positioning an eye of a patient comprising the steps of:
receiving a reflected beam from an anterior surface of a cornea of an eye of a patient;
comparing the received reflected beam with a reference beam calibrated to a desired position of the corneal anterior surface;
calculating from the comparing step a difference between an actual position and the desired position of the corneal anterior surface; and
moving the patient a distance in a direction for matching the actual position to the desired position of the corneal anterior surface.
8. The method recited in claim 7 , wherein the receiving and comparing steps are carried out with the use of an optical low-coherence interferometer.
9. The method recited in claim 7 , further comprising the step, prior to the receiving step, of directing a broad-bandwidth light source to the corneal anterior surface.
10. The method recited in claim 7 , wherein the patient-moving step comprises moving a patient support element the distance to achieve the desired position.
11. The method recited in claim 7 , wherein the receiving, comparing, calculating, and moving steps are carried out in a closed-loop feedback method.
12. The method recited in claim 7 , wherein the calculating step comprises calculating from the received reflected beam a signal for being communicated to a patient-moving device to achieve the desired position.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/682,608 US20080218692A1 (en) | 2007-03-06 | 2007-03-06 | Reflectometry/Interferometry System and Method for Corneal Plane Positioning |
PCT/US2008/055842 WO2008109627A1 (en) | 2007-03-06 | 2008-03-05 | Reflectometry/interferometry system and method for corneal plane positioning |
DE602008002304T DE602008002304D1 (en) | 2007-03-06 | 2008-03-05 | REFLECTOMETRIE- / INTERFEROMETRIESYSTEM AND METHOD FOR POSITIONING A HORNHAUTSCHICHT |
EP08731386A EP2061412B1 (en) | 2007-03-06 | 2008-03-05 | Reflectometry/interferometry system and method for corneal plane positioning |
AT08731386T ATE478641T1 (en) | 2007-03-06 | 2008-03-05 | REFLECTOMETRY/INTERFEROMETRY SYSTEM AND METHOD FOR POSITIONING A CORNEA LAYER |
US12/612,924 US7954945B2 (en) | 2007-03-06 | 2009-11-05 | Reflectometry/interferometry system and method for corneal plane positioning |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/682,608 US20080218692A1 (en) | 2007-03-06 | 2007-03-06 | Reflectometry/Interferometry System and Method for Corneal Plane Positioning |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/612,924 Continuation US7954945B2 (en) | 2007-03-06 | 2009-11-05 | Reflectometry/interferometry system and method for corneal plane positioning |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080218692A1 true US20080218692A1 (en) | 2008-09-11 |
Family
ID=39661553
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/682,608 Abandoned US20080218692A1 (en) | 2007-03-06 | 2007-03-06 | Reflectometry/Interferometry System and Method for Corneal Plane Positioning |
US12/612,924 Active US7954945B2 (en) | 2007-03-06 | 2009-11-05 | Reflectometry/interferometry system and method for corneal plane positioning |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/612,924 Active US7954945B2 (en) | 2007-03-06 | 2009-11-05 | Reflectometry/interferometry system and method for corneal plane positioning |
Country Status (5)
Country | Link |
---|---|
US (2) | US20080218692A1 (en) |
EP (1) | EP2061412B1 (en) |
AT (1) | ATE478641T1 (en) |
DE (1) | DE602008002304D1 (en) |
WO (1) | WO2008109627A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
PT2306948T (en) * | 2008-06-30 | 2018-01-24 | Wavelight Gmbh | Device for ophthalmologic, particularly refractive, laser surgery |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050018137A1 (en) * | 1998-12-10 | 2005-01-27 | Roland Barth | System and method for the non-contacting measurement of the axis length and/or cornea curvature and/or anterior chamber depth of the eye, preferably for intraocular lens calculation |
US20050140981A1 (en) * | 2002-04-18 | 2005-06-30 | Rudolf Waelti | Measurement of optical properties |
US20050192562A1 (en) * | 2004-03-01 | 2005-09-01 | Frieder Loesel | System and method for positioning a patient for laser surgery |
US20050203422A1 (en) * | 2004-02-10 | 2005-09-15 | Jay Wei | Optical apparatus and methods for performing eye examinations |
US20080144771A1 (en) * | 2006-10-16 | 2008-06-19 | Oraya Therapeutics, Inc. | Portable orthovoltage radiotherapy |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7390089B2 (en) * | 2005-02-25 | 2008-06-24 | 20/10 Perfect Vision Optische Geraete Gmbh | Device and method for aligning an eye with a surgical laser |
ES2373056T3 (en) | 2005-07-29 | 2012-01-31 | Alcon Refractivehorizons, Inc. | POSITIONING SYSTEM OF OPHTHALMIC DEVICE AND ASSOCIATED METHODS. |
-
2007
- 2007-03-06 US US11/682,608 patent/US20080218692A1/en not_active Abandoned
-
2008
- 2008-03-05 AT AT08731386T patent/ATE478641T1/en not_active IP Right Cessation
- 2008-03-05 DE DE602008002304T patent/DE602008002304D1/en active Active
- 2008-03-05 WO PCT/US2008/055842 patent/WO2008109627A1/en active Application Filing
- 2008-03-05 EP EP08731386A patent/EP2061412B1/en not_active Not-in-force
-
2009
- 2009-11-05 US US12/612,924 patent/US7954945B2/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050018137A1 (en) * | 1998-12-10 | 2005-01-27 | Roland Barth | System and method for the non-contacting measurement of the axis length and/or cornea curvature and/or anterior chamber depth of the eye, preferably for intraocular lens calculation |
US20050140981A1 (en) * | 2002-04-18 | 2005-06-30 | Rudolf Waelti | Measurement of optical properties |
US20050203422A1 (en) * | 2004-02-10 | 2005-09-15 | Jay Wei | Optical apparatus and methods for performing eye examinations |
US20050192562A1 (en) * | 2004-03-01 | 2005-09-01 | Frieder Loesel | System and method for positioning a patient for laser surgery |
US20080144771A1 (en) * | 2006-10-16 | 2008-06-19 | Oraya Therapeutics, Inc. | Portable orthovoltage radiotherapy |
Also Published As
Publication number | Publication date |
---|---|
US7954945B2 (en) | 2011-06-07 |
WO2008109627A1 (en) | 2008-09-12 |
ATE478641T1 (en) | 2010-09-15 |
DE602008002304D1 (en) | 2010-10-07 |
EP2061412B1 (en) | 2010-08-25 |
EP2061412A1 (en) | 2009-05-27 |
US20100277689A1 (en) | 2010-11-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ALCON REFRACTIVEHORIZONS, INC., TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HOPLER, MARK D;REEL/FRAME:019697/0474 Effective date: 20070717 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |