341 results about "Stigmatism" patented technology

A toric multifocal lens including a plurality of vision correction regions having centers on a common optical center axis, the plurality of vision correction regions providing respective different values of a spherical optical power, each of the plurality of vision correction regions having an optical power for correction of astigmatism, wherein the improvement comprises: at least one of a cylindrical optical power and a cylindrical axis orientation which determine the optical power for correction of astigmatism being different in at least two different vision correction regions of the plurality of vision correction regions, so that the at least two different vision correction regions have respective different values of the optical power for correction of astigmatism.

A method and device for flapless, intrastromal keratomileusis for the correction of myopia, hyperopia and astigmatism, i.e., for vision correction by corneal reshaping without creating a flap. Ultra-short laser pulses are used to create a temporary micro-channel extending to an end point located within the cornea. A second series of ultra-short laser pulses are then delivered to photo-ablate material in the vicinity of the micro-channel end-point. The photo-ablated material may exit through the micro-channel used to deliver the laser pulses, or via a separate micro-channel. With the micro-channel oriented substantially normal to the optical axis of the cornea, and by continuing to supply the ultra-short laser pulses in the appropriate number while moving the point of ablation along the micro-channel, the photo-ablation of the intrastromal tissue may continue in a controlled fashion and the cornea reshaped in a predetermined manner without creating a flap.

An ophthalmic lens with premium vision corrections provides significantly improved visual acuity and contrast sensitivity. The premium vision corrections include precisely correcting for two aberration mode sets simultaneously, second-order astigmatism and fourth-order spherical aberration, instead of correcting for only second-order astigmatism or simultaneously correcting for all aberrations present. Fourth-order astigmatism, sixth-order spherical aberration, and third-order coma are additionally corrected in other premium vision correction schemes. In addition, methods are provided for prescribing and fabricating the premium vision lenses to permit mass customization.

The present invention relates to an optical assembly which improves color uniformity and improved collimation of light produced by multiple LED light sources in a light engine. The optical assembly is specifically tailored to match the placement of the solid-state emitters making up the light engine or light producing element. Specifically, a shaped free-form spline patch inner collimation lens having an optimized cross-sectional shape and micro-ridges is used to disperse light; multi-lobe TIR collimation lens having an optimized cross-sectional shape and micro-ridges is used to disperse and redistribute phase as well as provide collimation; primary mixing lenslet array having an optimized surface is used to disperse light from the light emitter; a spline profile reflector further mixes and collimates the light; a secondary lenslet array further mixes the light; and a secondary collimation lens further collimates the light.

An ophthalmic lens for placement on the human eye or implanted into an eye is described. The lens has a cylinder power for eye astigmatism refraction error correction and incorporates aspherization of at least one of the surfaces to reduce vision quality reduction with toric ophthalmic lens rotation that creates meridional misalignment as compared with the equivalent toric lens with non-aspherized surface.

A molded contact lens comprising a stiffer optic zone relative to the peripheral zone of the contact lens provides an optical element for correcting astigmatism without the need for or substantially minimizing the need for the correction of rotational misalignment. The higher elastic modulus optic zone vaults over the cornea thereby allowing a tear lens to form. The tear lens follows or assumes the shape of the back surface of the contact lens. The combination of the tear lens and the optical zone provide an optical element for correction of refractive error.

A projection illumination fixture includes luminescent light tubes lined with an emulsion coating of titanium dioxide and phosphors for producing an appropriate mixture of highly scattered red, blue and green wavelengths of sustained luminescent light emission, a reflector housing for reflecting scattered rays of emitted luminescent light toward an aperture, a catadioptric lens for collecting and redirecting luminescent light rays reaching the aperture into and through a light snoot or barrel and a large area projection (magnifying) Fresnel lens at the end of the light snoot or barrel for directing and spreading the emitted light to fill an illumination field with directional divergent light ideal for dimensionally "painting' talent and objects positioned and moving within the illumination field.

There is disclosed a multimode seeker including an imaging infrared seeker and a radio frequency seeker. The imaging infrared seeker and the radio frequency seeker may share an optical system adapted to form an infrared image of an outside scene on a focal plane array image detector and to collimate radio frequency radiation transmitted from a radio frequency transceiver and focus millimeter ware radiation received from the outside scene onto the radio frequency transceiver. The shared optical system may include a plurality of baffles to block sunlight from reaching the focal plane array image detector, each baffle comprising a material that is opaque to infrared radiation and transparent to radio frequency radiation.

A method for generating retinal images using the stigmatism of the two foci (F, F′) of a substantially elliptical sight (E) with a semi-reflective surface, wherein a so-called object focus consisting of the diaphragm of a pinhole disc forming the convergence point of an image generated by a light-emitting display or a collimated light source is positioned adjacent to the first focus (F) of the substantially elliptical sight (E), a so-called image focus consisting of the pupil or the centre of the user's eye (OE) is positioned adjacent to the second focus (F′) of said substantially elliptical sight (E), and the image generated by said light-emitting display or said collimated light source and reflected by the semi-reflective surface of the substantially elliptical sight (E) is projected adjacent to the retina of the user's eye.

Ophthalmic lenses for correcting refractive error of an eye are disclosed. Ophthalmic lenses include a deformable inner portion and a deformable peripheral portion. When disposed over the optical region of an eye, the inner portion is configured so that engagement of the posterior surface against the eye deforms the posterior surface so that the posterior surface has a shape diverging form the refractive shape of the epithelium when viewing with the eye through the ophthalmic lens. The rigidity of the inner portion is greater than the rigidity of the peripheral portion and the ophthalmic lenses are configured to allow movement relative to the eye upon blinking of the eye and to be substantially centered on the optical region of the cornea following the blinking of the eye. Methods of correcting refractive errors of an eye such as astigmatism or spherical aberration using the ophthalmic lenses are also disclosed.

Provided herein is a measurement tool for implantable non-spherical asymmetric optics comprising a viewable, rotatable angular caliper superimposable over an image of an eye. Also provided are methods for optimally placing non-spherical asymmetric optics in an eye of a patient and for correcting post-operative astigmatism in a patient having cataract surgery. The measurement tool is useful to plan the optimal correct surgical placement of a non-spherical asymmetric optic, e.g., a toric intraocular implant or a toric intraocular contact lens, in the eye. By superimposing the measurement tool over a corneal topographic image, an optimal positioning of the non-spherical asymmetric optic can be effected in an optical zone of interest. Correct placement or re-placement at least minimizes astigmatism in post-operative vision. Also provided are computer program products and computer readable media comprising modules and methods for data entry, lens selection and surgical planning utilized to practice the methods provided herein.

A method of correcting the effects of a bend angle of 200 degrees or larger of spectacle frames, and astigmatism correcting characteristics in such spectacle frames. An exemplary embodiment of the present invention includes a design method for a spectacle lens mounted in a spectacle frame having a bend angle of 200 degrees or larger including an astigmatic power adding step, on the object side refractive surface or eyeball side refractive surface of the spectacle lens, for canceling astigmatic aberration caused by the bend angle of the spectacle frame, at a design reference point of the spectacle lens, and a step setting prismatic power by tilting the refractive surface, which is on an object side or an eyeball side, of the spectacle lens for canceling prismatic power caused by the bend angle of the spectacle frame, at the design reference point of the spectacle lens.

The invention discloses a side loading LED module for rear assembled lamp mounted of assembled lamp mounted on the rear part of a motor vehicle. One or more LED are mounted on remote side of a printed circuit board with a circuit that drives the one or more LED. A circuit board and a heat yielding pad are fixed onto a heat radiator by screw thread or rivets, then the heat radiator is mounted on lateral face of an outer housing. The LED emits astigmatism in the outer housing. One surface of the outer housing is multi-faceted parabolic reflector, which receives divergent light from the LED, and reflects the collimated light beam to foreside of the outer housing vertically, and there ejaculated from the lamp through a transparent cover. Each facet on the parabolic reflector makes part of the reflected light beam off set angularly, and reflected light is collimating with angle wider than single collimated light beam.

A side-loading LED module for a rear combination lamp is disclosed. One or more LEDs are mounted on a distal side of a printed circuit board, which also includes the circuitry that drives the one or more LEDs. The circuit board and a thermal pad are screwed/riveted to a heat sink, then the heat sink is mounted to a lateral face of a housing. The LEDs emit diverging light laterally inside the housing. One face of the housing is a faceted parabolic reflector, which receives the diverging light from the LEDs and reflects a collimated beam longitudinally to the front of the housing, where it passes through a clear cover and exits the lamp. The facets on the parabolic reflector angularly deviate portions of the reflected beam, so that the reflected light is collimated, and is angularly broader than a single collimated beam.

The invention relates to a lens stray light detection device for detecting stray light of a lens. The lens stray light detection device comprises a workbench, a lens bearing seat arranged on the surface of the workbench, a light source bearing seat arranged on the surface of the workbench, a rail formed on the surface of the workbench, a light source arranged at the top of the light source bearing seat, and an image acquisition unit. The lens bearing seat is used for bearing the lens. The light source bearing seat is glidingly connected with the rail. When the light source bearing seat glides along the rail, rays emitted by the light source face the lens all the time. The image acquisition unit receives the rays from the lens to form images. The workbench is provided with a plurality of scale lines for indicating the angles of the rays emitted by the light source relative to the optic axis of the lens. The invention also relates to a lens stray light detection method.

This invention relates to an in-situ test method for stray light in a step scan projection aligner, which limits a spot on an object face by accurately positioning four slit blades and images on a working platform by a projecting object lens. An energy sensor tests that the light intensity at the spot photo center is Lo and finishes testing to MXN spots then to open the slit, the light intensity of above mentioned point light intensity is measured to be l, the stray light coefficient is computed by formula (1, -10)/10, if the stray light exceeds the required target of the exposure system, it analyses source of stray light. A special mask and two slit blades limit a spot imaged by projection object lens, an energy sensor tests light intensity distribution in the image spot to analyze if the stray light is from the illumination system or the project object lens.

There is provided an optical system and method for shaping a polychromatic light into a substantially uniform profile beam along a first axis. A polychromatic divergent light with having multiple wavelength components is provided with a dispersion of divergence. A collimation optic collimates the polychromatic divergent light. A shaping lens shapes the collimated beam into a shaped beam with a nearly uniform profile along the first axis, the dispersion of divergence causing a deviation from uniformity of the nearly uniform profile. A focusing optic focuses the shaped beam. A combination of the collimation and focusing optics shows a chromatic focal shift that compensates for said dispersion of divergence, so as to reduce the deviation from uniformity to obtain a profile with a substantially uniform intensity along the first axis, for all of said multiple wavelength components.

Disclosed is a computer-implemented method for correcting refractive errors in a living eye using a laser vision correction system that involves first calculating an amount of sphere based on preoperative manifest refraction and higher order aberrations data associated with the eye, and then correcting for the calculated amount of sphere by ablating at least a portion of the eye. The preoperative manifest refraction may include preoperative manifest sphere, preoperative spherical equivalent, regular astigmatism, and oblique astigmatism, and the preoperative higher-order aberrations may include 4th-order spherical and 3rd root mean square. Other factors may also be used to adjust the calculated amount of sphere. A device readable medium for storing the calculation and instructions for operating a laser vision correction system for practicing the method is also disclosed, as is a method of treating refractive errors.