Haag-streit Ag

Lucio Robledo

Peter Stalder

Philippe Cattin

André Meznaric

Christian Zoss

Ernst Rindlisbacher

Joerg Breitenstein

Pascal Kesselring

Kaspar Baltzer

Christian Schlaeppi

André Huber-Meznaric

Jörg Breitenstein

Jörg Wagner

Silja Kiriyanthan

Bernhard Von Waldkirch

Jonas Haehnle

Christian Schläppi

Data representing structures in an eye, in particular data for a cross-sectional image, is recorded by generating a plurality of A-scans using swept-source OCT at different locations in the eye, each of which generates a plurality of reflection values for a plurality of points along a light trace. Combined values are then calculated from several reflection values at different locations in the eye. For improving data quality, a model of at one curved structure in the eye is fitted to the reflection values, and it is then used for identifying the points on the A-scans that are to be combined. This allows to project the data along a tangential direction of the curved structures for reducing noise and for obtaining improved resolution in the direction perpendicular to the structure.

Optical coherence tomography system for ophthalmology

The invention relates to an OCT system, comprising: an OCT light source for emitting OCT light into an object beam path and a reference beam path; and a detector for capturing an interference signal produced from the object beam path and the reference beam path. A wavelength-dependent beamsplitter is arranged in the OCT beam path such that a first spectral partial beam is guided along a longer path and a second spectral partial beam is guided along a shorter path. The invention further relates to a corresponding OCT method. Two measurement regions separated from each other can be sensed by means of the OCT system according to the invention.

OCT system and OCT method

The invention relates to a method for performing a movement correction when measuring a human eye, in which the eye is scanned by a measurement beam in order to obtain a set of position values of an eye structure. Scanning extends over a measurement time interval, wherein the position values are each provided with a timestamp within the measurement time interval. A surface shape and a displacement function are determined, with the displacement function representing a movement pattern during the measurement time interval, and the surface shape and the displacement function being determined in such a way that the position values are approximated by the surface shape when the surface shape is moved according to the displacement function. Moreover, the invention relates to an associated measurement system.

Method for performing a movement correction when measuring eyes, and measurement system

The invention relates to an OCT system with an OCT light source for emitting OCT light into an object beam path and a reference beam path. The system comprises a detector for detecting an interference signal produced by the object beam path and the reference beam path. A polarization-dependent delay element is arranged in the object beam path. The invention also relates to a corresponding OCT method. The invention allows the effects of parasitic reflections to be reduced.

In a method for calibrating an interferometer () having a beam path for a measuring beam (), wherein at least one plane () that at least partially reflects the measuring beam () has been introduced into the beam path, and wherein a normal to a first plane () is inclined at a first angle to a measuring beam () incident on the first plane (), the following steps are carried out: interferometric measurement of a first axial spacing of a first point on the first plane () with the measuring beam (), and interferometric measurement of a second axial spacing of a second point on one of the at least one plane () with the measuring beam (), wherein the second point is spaced apart from the first point.

Calibration of an interferometer

In a method for registering measurement points on a body, in particular on an eye, measurement points are registered along a trajectory on a surface of the body, in particular a curved surface of the body, for determining an axial length profile, by way of a measurement beam. Here, a minimum radius of curvature of the trajectory is at least 1/7, preferably at least &#x2155;, particularly preferably at least &#x2153; of a radius of a circumference of the surface.

Measuring method

In a method for interferometrically capturing measurement points of a region of an eye, a plurality of measurement points are captured by a measurement beam along a trajectory, wherein the same trajectory is passed over by the measurement beam in the region during at least a first iteration and a second iteration. The trajectory of the first iteration is rotated through an angle and/or displaced by a distance in relation to the trajectory of the second iteration in order to obtain a more homogeneous measurement point distribution.

Eye measurement

An adapter () for an apparatus () for measuring a first property of an eye is attachable to the apparatus (), wherein, when the adapter () is attached to the apparatus (), a second additional property of the eye is measurable.

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Bern, Switzerland

Lucio Robledo