EP1773181A1 - Systeme de mesure de front d'onde - Google Patents

Systeme de mesure de front d'onde

Info

Publication number
EP1773181A1
EP1773181A1 EP05778347A EP05778347A EP1773181A1 EP 1773181 A1 EP1773181 A1 EP 1773181A1 EP 05778347 A EP05778347 A EP 05778347A EP 05778347 A EP05778347 A EP 05778347A EP 1773181 A1 EP1773181 A1 EP 1773181A1
Authority
EP
European Patent Office
Prior art keywords
optical
wavefront
compensator
aberrations
precompensation
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.)
Withdrawn
Application number
EP05778347A
Other languages
German (de)
English (en)
Inventor
Michael Mrochen
Markus Meier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IROC AG
Original Assignee
IROC AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by IROC AG filed Critical IROC AG
Publication of EP1773181A1 publication Critical patent/EP1773181A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • A61B3/1015—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for wavefront analysis

Definitions

  • the invention relates to a system for frontal wavefront measurement with a wavefront sensor and a compensator for precompensation of optical aberrations of the radiation to be measured by the wavefront sensor.
  • optical aberrations of the prior art eye are measured with wavefront sensors.
  • wavefront sensors according to Shack-Hartmann and Tscherning are known.
  • Such micrometers permit the measurement of optical properties of the entire "eye" system and serve, in particular, as a basis for refractive surgical interventions, for example with the laser according to the LASIK method can serve both for diagnostic and therapeutic purposes in ophthalmology.
  • the state of the art already knows a so-called NulP measurement in front-of-line measurement, in which a large part of the aberrations of the eye are precompensated before the frontal measurement.
  • the precompensated error is known and the remaining error measured in the wavefront sensor can then be determined with much higher accuracy, because the so-called dynamic range of the wavefront sensor, ie the permissible distance between the maximum and minimum values, is greatly expanded.
  • the state of the art knows about the precompensation of optical errors, such as defocus and astigmatism, movable telescopes (Badal optometers) and even crossed cylindrical lenses.
  • US 2004/0041978 A1 also shows a system with a telescope which uses a spatial filter to eliminate the higher-order optical aberrations in a wavefront measured at the wavefront sensor.
  • An optical spatial filter does not compensate for optical aberrations, it just filters them.
  • the present invention has for its object to provide a system for wavefront measurement, in particular, higher-order aberrations in a simple manner and with high reliability can be precompensated to improve the dynamic range of the wavefront sensor used.
  • the invention provides a system for wavefront measurement comprising a wavefront sensor and a compensator for precompensation of optical aberrations of radiation directed into the wavefront sensor, wherein the compensator has optical elements transmitting precompensation of higher order optical aberrations and means are provided, to move at least one of the optical elements to adjust the pre-compensation.
  • a “higher-order optical aberration” is to be understood here in particular as an aberration of the third order and a higher order (coma-like aberration).
  • aberrations of the fourth order are also referred to as "optical aberrations of a higher order" to understand the present invention, ie spherical aberrations.
  • a transmitting optical element in this sense transmits the electromagnetic radiation and thus has a refractive effect for this radiation.
  • the invention is based on the finding that with transmitted optical elements the above-stated object can be achieved in an advantageous manner and the dynamic range of the wavefront sensor can be maximized with regard to certain selected optical aberrations, for example of an eye.
  • the means for moving at least one of the optical elements receive signals from the wavefront sensor in order to move the optical element as a function of the signal.
  • the precompensation can be selectively optimized, in particular with regard to the optical error of higher order to be pre-compensated and the improvement of the dynamic range with respect to certain optical aberrations to be gained thereby.
  • the precompensator also compensates for low-order optical errors in a known manner.
  • Another preferred embodiment of the invention provides means for displaying data corresponding to the precompensated wavefront so that a physician receives information about the precompensation during the wavefront measurement and, if desired, could intervene selectively. It is also possible to perform the precompensation without the static feedback described above in accordance with predetermined optical errors that are to be compensated.
  • the means for displaying the pre-compensated wavefront may also serve for a functional eye vision check of the eye.
  • the wavefront error of the eye which is ultimately to be measured then results from the wavefront measurement carried out after the precompensation, taking into account the precompensated error which is to be added to the result of the wavefront measurement.
  • FIG. 1 schematically shows a system for wavefront measurement with precompensation
  • FIG. 2 shows another system for wavefront measurement with precompensation using a Cherning aberrometer
  • FIGS. 3, 4 show details of a compensator for the precompensation
  • FIG. 5 shows a system for wavefront measurement with display devices.
  • FIG. 1 shows schematically the radiation course and the processing of the radiation.
  • a Shack-Hartmann sensor for wavefront measurement which is well known to the person skilled in the art, is used.
  • the illustration in FIG. 1 begins with the "eye" optical system 10.
  • the measuring beam directed to the eye and its shaping are sufficiently known as such and omitted from FIG optical aberration (aberrations) of the eye, ie in particular the knew aberrations simpler and higher order.
  • a typical higher-order aberration is known to be the spherical aberration.
  • This radiation from the eye is input to an optical system 12, for example a telescope. Thereafter, the radiation enters a compensator 14, which precompensates the wave front.
  • This compensator 14 has transmitting optical elements in the above sense, ie the elements transmitting and refracting radiation, which are shown by way of example in FIGS. 3 and 4.
  • the compensator 14 performs a pre-compensation of higher-order optical errors.
  • the compensator 14 After precompensation in the compensator 14, the radiation passes through an optical system 16, with which it is imaged onto a wavefront sensor 18.
  • the wavefront sensor 18 enables a wavefront measurement with the features and advantages described above. With the components described above, the system first of all enables static precompensation with a predefinable optical error which is to be compensated.
  • the compensator 14 has movable trans ⁇ mittierende optical elements ( Figure 3, 4), which are movable by means of a controller 20.
  • the measurement result is fed back from the wavefront sensor 18 to the compensator 14 by means of the control electronics 20.
  • the individual transmitting optical elements of the compensator 14 can then be dependent on the measurement signal of the wavefront sensor 18 optionally be set so that the Dynamik ⁇ range in the wavefront sensor 18 can be maximized in terms of particularly interesting higher order error.
  • FIG. 2 shows a system for wavefront measurement using a Chering Aberrometer.
  • the components for generating and shaping and guiding the laser beam with which the measurement is carried out have been omitted.
  • the illustration in FIG. 2 begins with the mask system 22 for generating a dot pattern with which the optical aberrations of the eye in FIG known manner to Cherning be measured.
  • the dot pattern is imaged via an optical system 24, for example a telescope, into a wavefront compensator 26, of which exemplary embodiments are illustrated in FIGS. 3 and 4.
  • the compensator 26 thus again has transmitting optical elements.
  • the radiation coming from the compensator 26 is imaged onto the retina of the eye 30 via imaging optics 28. This image is imaged in a manner known per se in the wavefront sensor 32, ie in this case the Cherning aberrometer, for measuring the point shifts.
  • the wavefront compensator 26 is controlled with its individual components by means of a controller 34 in such a way that the desired precompensation takes place.
  • a feedback from the wavefront sensor 32 to the wavefront compensator 26 is provided, with control electronics 34 receiving signals from the wavefront sensor 32 in order to control the elements of the compensator 26 to achieve a desired precompensation in accordance with these signals.
  • the mitteis the compensators 14 and 26 to be performed precompensation can be, for example, a spherical aberration, a coma or an astigmatism.
  • the lens system according to FIG. 3 is an afocal telescopic Galileo system. After the lens 4, the beam path is parallel and is focused by the lens 5 on the image plane. The first lens 1 is spherically strongly overcorrecting. The lens 4 of the telescopic system is spherically corrected. The adjustment (control) of, for example, spherical aberration occurs in the lens group 2/3. This lens group has virtually no refractive power, but a strong spherical undercorrection by the lens 2.
  • the lens group 2/3 can also be used to adjust a coma. For this purpose, it is moved in the xy plane (perpendicular to the paper plane). Two elements compensating for spherical aberration produce a coma during lateral displacement (see Lopez, "Generation of third-order spherical and aberrations by use of symmetrical four-order lenses", JOSA A, 15, 2563-2571 (1998)).
  • Astigmatism can be generated with the optical system according to FIG. 3, for example by tilting the lens 5. This is indicated by the curved arrow in FIG.
  • FIG. 4 accordingly shows a lateral displacement of the lenses 2/3 for generating coma, wherein at the same time the lens 5 is tilted with respect to the optical axis to produce astigmatism.
  • achromatic lens systems are corrected for spherical aberration and Ko ma, but they can not be corrected for astigmatism. This can be exploited for the purposes of the present invention. Since the image field curvature is likewise not corrected in the case of an achromatic image, the image plane is suitably curved so that it lies between the tangential and sagittal image surface.
  • the lens systems illustrated in FIGS. 3 and 4 allow, for example, a static, i. fixed predetermined control of the wavefront aberration with the mechanical assemblies not shown in detail for example, a linear movement for Er ⁇ generation of the spherical aberration and the coma, or for a rotation to produce the astigmatism. It is also possible to generate the desired wavefront aberration dynamically by means of a feedback control loop, as described with reference to FIGS. 1 and 2.
  • the optical elements according to FIGS. 3 and 4 thus make it possible to correct the dispersion (of the chromatic aberration) of the optical compensator.
  • FIG. 5 shows a further exemplary embodiment of a system for wavefront measurement, in which the components corresponding to the exemplary embodiment according to FIG. 1 are provided with the same reference numerals, supplemented by a dash. In that regard, reference is made to the above description.
  • information about the precompensated wavefront is displayed to the treating physician in a display device 40.
  • the optical elements according to FIGS. 3 and 4 can be arranged so that the examined eye can see through it. This can be used for eye tests. It is also possible to connect to the display devices 40 or 42 of Figure 5, an optical system to compensate for possible magnification errors due to the compensator 14 '. In this case, the magnifying optical system can also serve to carry out functional tests of the eyesight of the examined eye.

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Eye Examination Apparatus (AREA)

Abstract

L'invention concerne un système de mesure de front d'onde, comportant un détecteur de front d'onde (18) et un compensateur (14) servant à la précompensation d'aberrations optiques du rayonnement dirigé sur le détecteur de front d'onde. Selon l'invention, le compensateur (14) servant à la précompensation d'aberrations optiques d'ordre supérieur présente des éléments optiques transmissifs. Des moyens (20) sont utilisés pour déplacer au moins un des éléments optiques servant à ajuster la précompensation.
EP05778347A 2004-08-03 2005-08-02 Systeme de mesure de front d'onde Withdrawn EP1773181A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410037558 DE102004037558A1 (de) 2004-08-03 2004-08-03 System zur Wellenfrontmessung
PCT/EP2005/008358 WO2006015770A1 (fr) 2004-08-03 2005-08-02 Systeme de mesure de front d'onde

Publications (1)

Publication Number Publication Date
EP1773181A1 true EP1773181A1 (fr) 2007-04-18

Family

ID=35219426

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05778347A Withdrawn EP1773181A1 (fr) 2004-08-03 2005-08-02 Systeme de mesure de front d'onde

Country Status (3)

Country Link
EP (1) EP1773181A1 (fr)
DE (1) DE102004037558A1 (fr)
WO (1) WO2006015770A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006061932A1 (de) * 2006-12-21 2008-07-10 Carl Zeiss Meditec Ag Anordnung für ophthalmologische Geräte zur Verbesserung von Fundusbildern

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6550917B1 (en) * 2000-02-11 2003-04-22 Wavefront Sciences, Inc. Dynamic range extension techniques for a wavefront sensor including use in ophthalmic measurement
US6746121B2 (en) * 2001-04-27 2004-06-08 Denwood F. Ross Defocus and astigmatism compensation in a wavefront aberration measurement system
US6631991B2 (en) * 2001-08-31 2003-10-14 Adaptive Optics Associates, Inc. Ophthalmic instrument having hartmann wavefront sensor deriving location of spots with spot fitting techniques
AU2003240945A1 (en) * 2002-05-31 2003-12-19 Wavefront Sciences, Inc. Methhod and system for sensing and analyzing a wavefront of an optically transmissive system

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
BUCHROEDER R.A. ET AL: "Aberration generator", APPLIED OPTICS, vol. 14, no. 10, 1 October 1975 (1975-10-01), pages 2476 - 2479, XP002082570 *
See also references of WO2006015770A1 *

Also Published As

Publication number Publication date
DE102004037558A1 (de) 2006-02-23
WO2006015770A1 (fr) 2006-02-16

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