摘要:
Apparatus and methods of treating a hard lens region of an eye with a laser where one method includes identifying a boundary of the hard lens region, selecting a laser-parameter to enable a photodisruptive procedure in the hard lens region and to control a spreading of bubbles in the hard lens region, modifying a mechanical property of a posterior portion of the hard lens region in a proximity of the identified boundary by the photodisruptive procedure, and modifying a mechanical property of a portion anterior to the modified posterior portion of the hard lens region by the photodisruptive procedure. The laser bubbles can be applied to form incisions which are non transverse to an axis of the eye and intersect the lens fibers.
摘要:
A system (10) and method for reshaping the cornea of an eye (16) with a laser that also incorporates a subsequent compensation for residual vision aberrations. A diagnostic unit (14) obtains a pre-op prescription for the eye (16) and predicts an induced refractive shift resulting from laser treatment. Based on this data, a preview lens (22) is selected or manufactured to evaluate the tolerance of a patient (18) to a predicted post-op vision. Then, a laser unit (24) is used to alter the cornea of the eye (16) (i.e. laser treatment) to increase the depth - of - field of the eye (16). Subsequently, after the laser treatment has been completed, conventional vision correction is provided by spectacles, intraocular lenses or contact lenses. This conventional correction will then compensate for any remaining pre-op aberrations, as well as any residual aberrations in the patient's post-op vision that may have been induced during the laser treatment.
摘要:
The invention relates to a controller for a surgical laser. According to the invention, the controller is adapted to control a laser in order to produce two or more three-dimensional compression zones, each comprising a plurality of lesions, inside a lens cortex of a crystalline lens of the eye using a laser pulse or multiple laser pulses, wherein the controller is adapted such that a laser can be calibrated with respect to a reference point within the lens, and each of the compression zones produced has a length in a radial direction, a depth in a direction parallel to the optical or visual axis and an average width in a direction parallel to a tangent of the lens cortex, wherein the sum of the average widths of all compression zones is 0.1 to 2 millimeter for every 1 diopter of desired gain in accommodation amplitude of the lens.
摘要:
The system according to the present invention is used to create an ablation such that the surface of the cornea comprises a central region having a convex central steepening with a first radius of curvature and a surrounding region having a convex shape with a second radius of curvature, wherein the first radius of curvature is smaller than the second radius of curvature for performing a presbyopic correction. The ablation depth in the central region varies between a minimum ablation depth in the center and a maximum ablation depth at the border of the central region. The ablation depth in the surrounding region is the same as the maximum ablation depth at the border of the central region.
摘要:
Methods, devices, and systems establish an optical surface shape that mitigates or treats a vision condition in a patient. An optical surface shape for a particular patient can be determined using a set of patient parameters for the specific patient by using a compound modulation transfer function (CMTF). The compound modulation transfer function can include a combination of modulation transfer functions (MTF's) at a plurality of distinct frequencies.
摘要:
A method for treating presbyopia utilizes an Erbium based, pulsed laser to sever sub-conjunctival strictures located within the scleral matrix of the eye. Introduction of treatment energy into the scleral matrix increases or facilitates an increase in accommodation, thereby mitigating the effects of presbyopia. The treatment energy can be directed into the scleral matrix to form tunnel ablations in and through the strictures of the scleral matrix. The tunnel ablations can enhance the accommodation of the patient's eye, enabling the eye to refocus at near distances while not losing its ability to focus at a distance.
摘要:
Methods and apparatus ( 610 ) are disclosed for diagnosing vision and improving vision in a manner which does not interfere with the natural shape of the cornea or its orientation relative to the remainder of the eye, but which changes its surface curvature appropriately to achieve the required correction of vision. The focus of the cornea ( 14 ) is adjusted so that different regions focus substantially to the same axis and preferably to substantially the same point on the axis. This can be accomplished by shaping the cornea (e.g. through ablation) or by applying an appropriate contact lens or other optical lens. In either case, correcting the central portions of the cornea should have a more significant effect on correcting focus scatter than correcting the more outward portions.
摘要:
The invention relates to a method and device for modifying optical system properties by means of a continuously multifocal profile, wherein said profile comprises a component for increasing the optical system focal depth and is calculated according to a fourth-order Zernike polynom. The aim of said invention is to avoid the eye base refraction and, for this purpose, said focal depth increasing component is also calculated according to the second-order Zernike polynom.