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公开(公告)号：US12226159B2
公开(公告)日：2025-02-18
申请号：US17492592
申请日：2021-10-02
Applicant: OPTOS PLC
Inventor： Praveen Ashok , Alan Anderson
Abstract: A method of processing B-scans acquired by an OCT imaging system to generate correction data for compensating for axial displacements between B-scans caused by a variation in distance between the OCT imaging system and an imaging target, and to generate a reliability indicator indicative of a reliability of the correction data. The correction data is generated by determining, for each pair of adjacent B-scans, a respective indicator of an axial shift between respective representations of a common ocular feature in the adjacent B-scans. The reliability indicator is generated by: calculating values indicative of speeds or accelerations of the imaging target relative to the OCT imaging system when pairs of B-scans were acquired; where at least a predetermined number of calculated values exceed a threshold, setting the reliability indictor to indicate that the correction data is unreliable, and otherwise to indicate that the correction data is reliable.
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公开(公告)号：US11635552B2
公开(公告)日：2023-04-25
申请号：US16636999
申请日：2017-08-14
Applicant: Optos PLC
Inventor： Alan Anderson , Praveen Ashok , Hiroshi Kasai , Alistair Gorman
Abstract: An optical system comprising: an optical element having an optical property responsive to an applied signal, a variation of the optical property with the signal exhibiting hysteresis in a first range of values and no hysteresis in a second range of values of the signal; a memory storing data representing a hysteresis curve which indicates the variation of the optical property with increasing and decreasing values of the signal; and a controller which continuously controls the optical property by: generating, based on the stored data, a cyclic signal having a discontinuity in each cycle of the cyclic signal, and setting the discontinuity size in each cycle based on the stored data such that a part of the variation of the optical property with the cyclic signal coincides with a part of the variation represented by the stored data; and applying the cyclic signal to the optical element.
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公开(公告)号：US11170213B2
公开(公告)日：2021-11-09
申请号：US16335169
申请日：2017-10-10
Applicant: OPTOS PLC , NIKON CORPORATION
Inventor： Alan Anderson , Praveen Ashok , Tomoharu Fujiwara , Yasushi Tanabe , Hiroshi Kintou , Mariko Hirokawa , Tadashi Umezaki
Abstract: There is provided an ocular image capturing device comprising an ocular image generating module operable to generate an image of a subject's eye based on light reflected from the eye, and a determination module arranged to determine whether or not at least a portion of a pupil region of the generated image is within a predetermined permissible region within the generated image, and to generate a signal that is indicative of the determination, the pupil region being an image of at least a portion of the pupil of the eye.
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Patent Agency Ranking
公开(公告)号：US20200242768A1
公开(公告)日：2020-07-30
申请号：US16637023
申请日：2017-08-14
Applicant: Optos PLC
Inventor： Praveen Ashok , Alan Anderson , Gonzalo Muyo , Alistair Gorman , Jano Van Hemert
Abstract: A method of controlling an ophthalmic device operable to image an imaging region of a retina and concurrently illuminate an illumination region of the retina, the method including acquiring a reference retinal image by imaging a reference imaging area of the retina; designating a target in the reference retinal image; acquiring a current retinal image of an initial imaging region within the reference imaging area; moving the imaging region from the initial imaging region to a destination imaging region using the target and the reference retinal image, and acquiring a retinal image of the destination imaging region; illuminating the illumination region while the imaging region is the destination imaging region; acquiring one or more retinal images while the illumination module is being illuminated; and comparing a marker retinal image based on the one or more retinal image(s) with a comparison image based on the reference retinal image.
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公开(公告)号：US11617509B2
公开(公告)日：2023-04-04
申请号：US16637075
申请日：2017-08-14
Applicant: Optos PLC
Inventor： Alan Anderson , Iain Gourlay , Praveen Ashok
Abstract: An ophthalmic device including an illumination module which scans light across a region of the retina of an eye when the pupil is disposed at a focal point of the illumination module. The ophthalmic device further comprises components (2, 3-1, 4-1) for: aligning the pupil with the focal point; monitoring a position of the pupil relative to the focal point and maintaining the alignment based on the monitored position; aligning a scan location of the illumination module on the retina to a target scan location while the alignment of the pupil with the focal point is being maintained, wherein the illumination module performs a scan at the target scan location. The ophthalmic device further maintains the scan location at the target scan location while the alignment of the pupil with the focal point is being maintained, using scan location correction information based on retinal feature information.
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公开(公告)号：US20220296094A1
公开(公告)日：2022-09-22
申请号：US17205501
申请日：2021-03-18
Applicant: OPTOS PLC
Inventor： Praveen Ashok , Alan Anderson
Abstract: A multimode optical coherence tomography (OCT) imaging system comprises a light source arranged to emit coherent light in a path to scan a sample. An optical parameter unit is arranged in the path and is operable in at least one selected mode from among a plurality of available operating modes, including at least a first mode, a second mode and a third mode. A detector is arranged to detect reflected light, the reflected light being light reflected in the path as a result of the coherence light scanning the sample. A controller is arranged to control at least one of the light source or the optical parameter unit. The first, second and third modes include a retina mode, anterior segment mode, and biometry mode, respectively. Also provided are a method for operating a multimode OCT imaging system, and a computer-readable storage medium storing a program for performing the method.
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公开(公告)号：US20220287559A1
公开(公告)日：2022-09-15
申请号：US17200800
申请日：2021-03-13
Applicant: OPTOS PLC
Inventor： Praveen Ashok , David Evans
Abstract: An ophthalmic optical coherence tomography instrument, method, and computer-readable medium. The instrument includes a scanner defining an apparent point source for scanning sample light across a subject position and an objective having a posterior imaging configuration to project the apparent point source onto a pivot point between the objective and the subject position. The objective is settable between the posterior imaging configuration for scanning the sample light across a retina of an eye at the subject position and an anterior imaging configuration for scanning the sample light across a pivot plane. An axial region from which an interferogram is detectable extends across the pivot plane while the objective is in the anterior imaging configuration. A pupil alignment method uses the anterior imaging modality to obtain a structure position of a structure of an eye's anterior segment and then an offset between the structure position and a reference position.
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公开(公告)号：US11426072B2
公开(公告)日：2022-08-30
申请号：US16594985
申请日：2019-10-07
Applicant: Optos Plc
Inventor： Sriram Vikraman Sithalakshmi Amma , Praveen Ashok , Daniel Hurst
Abstract: An ophthalmic scanning system includes a first imaging modality, a second imaging modality different from the first imaging modality, and a control system that maps the first imaging modality to the second imaging modality by compensating for at least one of an optical-mechanical and an electro-mechanical projection difference between the first and second imaging modalities. The control system provides a scan location for the second imaging modality based on a scan location of the first imaging modality.
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