Wavelight Gmbh

Alcon, Inc.

Ole Massow

Henning Wisweh

Klaus Wolfgang Vogler

Claudia Gorschboth

Martin Eil

Sascha Birkner

Tobias Jeglorz

Johannes Loerner

Carsten Thomas

Klaus Vogler

A system and method for determining eye surface contour using multifocal keratometry is disclosed. The system includes a light source, a light detector, a processor, a non-transitory machine-readable medium communicatively coupled to the processor, and instructions stored on the non-transitory machine-readable medium. The instructions, when loaded and executed by the processor, cause the processor to project a light, using the light source, onto a plurality of surfaces of an eye; create, using the light detector, an image of a plurality of reflections, each of the plurality of reflections created by reflecting the light off of one of the plurality of surfaces of the eye; determine that the plurality of reflections are in focus in the image; and calculate, based on the determination, a curvature of the plurality of surfaces of the eye based on the image.

Determining eye surface contour using multifocal keratometry

An apparatus for optical coherence tomography (OCT) comprises a light source, a first arm, a second arm, and a processing unit. The first arm has a first dispersive optical assembly that induces a first amount of dispersion into light from the light source and traversing the first arm, where the first arm is one of a sample arm and a reference arm of an interferometer. The second arm has a second dispersive optical assembly that induces a second amount of dispersion into light from the light source and traversing the second arm, where the second arm is the other of the sample arm and reference arm. The second amount of dispersion is larger than the first amount of dispersion. The processing unit processes an interferometry signal to perform OCT, where the interferometry signal represents a superposition of the light from the first arm and the light from the second arm.

Dispersion encoded full range optical coherence tomograph

In a process for optical coherence tomography a plurality of first OCT slice images, in each first slice image representing a different slice of an object, are recorded. Subsequently a reference figure that is representative of the three-dimensional contour of at least one structural feature of the object in a given three-dimensional coordinate system is ascertained by feature recognition of the at least one structural feature in the first slice images. Then a plurality of second OCT slice images, each second slice image representing a different slice of the object, are recorded. At least a fraction of the second slice images are displaced in the coordinate system until each second slice image is in feature overlap with the reference figure. Lastly, a set of three-dimensional OCT image data is generated at least from the feature-overlapped second slice images.

Process for optical coherence tomography and apparatus for optical coherence tomography

A technique for optical coherence tomography is provided. As to a device aspect of the technique, an imaging device comprises a base defining a rotation axis, a scanning and focusing assembly mounted to the base for rotation about the rotation axis, and a drive unit for rotationally driving the scanning and focusing assembly about the rotation axis. The scanning and focusing assembly includes a focusing device for focusing a beam of imaging radiation to produce a focused beam of imaging radiation having a focus, a scanning member for scanning the beam of imaging radiation, and a controller coupled to the drive unit and the scanning member and configured to control the scanning member to cause movement of the focus along a predetermined trajectory with respect to the scanning and focusing assembly.

Imaging technique for optical coherence tomography

In certain embodiments, a device for optical coherence tomography (OCT) includes a signal detection device and a computer arrangement. The signal detection device is designed to detect an interference signal (G(&#x3c9;)) for an object to be imaged in an optical frequency range (&#x3c9;). The computer arrangement is designed to determine intermediate signals (G(), G()) in a spatial frequency range (k) from the intermediate interference signal (G(&#x3c9;)), whereby each of the intermediate signals (G(), G()) is dispersion-compensated for a different depth (z, z) of the object. A locally resolved image signal (FFT, FFT) is determined for each of the intermediate signals (G(), G()) by applying a Fourier transformation to the particular intermediate signal (G(), G()). A tomography signal (G(z)) is determined from the image signals (FFT, FFT).

Device for optical coherence tomography

In certain embodiments, a device for optical coherence tomography (OCT) includes a signal detection device and a computer arrangement. The signal detection device is designed to detect an interference signal (G(&#x3c9;)) for an object to be imaged in an optical frequency range (&#x3c9;). The computer arrangement is designed to determine intermediate signals (G(k), G(k)) in a spatial frequency range (k) from the interference signal (G(&#x3c9;)), whereby each of the intermediate signals (G(k), G(k)) is dispersion-compensated for a different depth (z, z) of the object. A locally resolved image signal (FFT, FFT) is determined for each of the intermediate signals (G(k), G(k)) by applying a Fourier transformation to the particular intermediate signal (G(k), G(k)). A tomography signal (G(z)) is determined from the image signals (FFT, FFT).

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Nuremberg, Germany

Ole Massow