CORNEAL LENTICULAR INCISION USING A FEMTOSECOND LASER WITH SMOOTH SCANNING TRAJECTORY CONNECTING MULTIPLE SWEEPS

    公开(公告)号:US20230320898A1

    公开(公告)日:2023-10-12

    申请号:US17658229

    申请日:2022-04-06

    发明人: Wenzhi Gao Hong Fu

    IPC分类号: A61F9/008

    摘要: An ophthalmic laser system and related method for forming a lenticular incision in a corneal lenticule extraction procedure. The lenticular incision is formed by multiple sweeps of a laser scan line along meridians of longitude of the lenticular incision, where the end point of each sweep is connected to the start point of the next sweep by a smooth turning trajectory. The trajectory includes a first circular arc tangentially connected to the first sweep at its end point, a second circular arc tangentially connected to the next sweep at its start point, and a straight line segment tangentially connected to both circular arcs. The smooth trajectory is determined with the given limits of velocity, acceleration and jerk of the XY scanning motors, without using high frequency filters to smooth the trajectory, thereby avoiding unknown changes to the original trajectory and achieving high precision lenticule shapes.

    OPHTHALMIC LASER SURGICAL SYSTEM AND METHOD FOR WAVEFRONT-GUIDED CORNEAL LENTICULE EXTRACTION FOR VISION CORRECTION

    公开(公告)号:US20230277377A1

    公开(公告)日:2023-09-07

    申请号:US17653127

    申请日:2022-03-01

    发明人: Hong Fu

    IPC分类号: A61F9/008 A61F9/013

    摘要: A ophthalmic laser-assisted corneal lenticule extraction procedure that uses wavefront measurements to guide the formation of the corneal lenticule. The wavefront map measured from a free eye using a wavefront aberrometer is registered to the cornea of a docked eye based on comparisons of iris images and corneal markings. The docked-eye cornea-registered wavefront map is then corrected to be consistent with the Munnerlyn formula for the spherical power, and adjusted for any physician adjustments and/or myopia error due to a flat add in the lenticule, using Zernike polynomials. The corrected and adjusted wavefront map is then used to calculate the profiles of the bottom and top lenticule incisions in the applanated cornea, where higher-order components in the wavefront map are distributed to the bottom lenticule incision alone and lower-order components in the wavefront map are distributed to both the bottom and the top lenticule incision.

    Methods and systems for optical coherence tomography scanning of cornea and retina

    公开(公告)号:US11730361B2

    公开(公告)日:2023-08-22

    申请号:US17246507

    申请日:2021-04-30

    摘要: An instrument includes: one or more scanning mirrors to receive an OCT sample beam and to scan the sample beam in two orthogonal directions; and an optical system to receive the sample beam and provide the sample beam to an eye. The optical system includes: a first lens having a first focal length, disposed along an optical path from the scanning mirror(s) to the eye at a distance from the cornea which is approximately equal to the first focal length, and a second lens disposed along the optical path between the first lens and the scanning mirror(s). The second lens receives the sample beam from the scanning mirror(s) and provides the sample beam to the first lens as a converging beam such that, as the sample beam is scanned, the sample beam passes through a pivot point located along an optical axis between the eye and the first lens.

    WATER-IMMERSED HIGH PRECISION LASER FOCUS SPOT SIZE MEASUREMENT APPARATUS

    公开(公告)号:US20230175838A1

    公开(公告)日:2023-06-08

    申请号:US18157729

    申请日:2023-01-20

    IPC分类号: G01B11/24

    CPC分类号: G01B11/2408

    摘要: A measurement apparatus for measuring a laser focus spot size, which includes a two-dimensional image detector and an imaging system which forms a magnified image of a focus spot located an object plane onto the image detector. The imaging system includes at least an objective lens. A sealed liquid container is secured over a part of the objective lens such as the optical surface of the objective lens is immersed in the liquid (e.g. water) within the container. The liquid container has a window through which the laser beam enters. An image processing method is also disclosed which processes the image obtained by the image detector to obtain the focus spot size while implementing an algorithm that corrects for the effect of ambient vibration.