37 results about "Back vertex distance" patented technology

A method of deriving a prediction model and calculating a predicted lens power to provide a desired post-operative spherical equivalent to correct myopia in a phakic eye of a patient using an intraocular lens includes measuring and determining the predictive significance of certain pre-operative characteristics of the eye, including cycloplegic and manifest spherical equivalent, vertex distance, anterior chamber depth, axial length, and keratometry. The prediction model is derived using multiple regression analysis on the pre-operative and post operative data. Measured data corresponding to a particular patient is used in the lens power prediction model to calculate the predicted lens power for implantation in the patient.

The present invention provides methods, systems and software for scaling optical aberration measurements of optical systems. In one embodiment, the present invention provides a method of reconstructing optical tissues of an eye. The method comprises transmitting an image through the optical tissues of the eye. Aberration data from the transmitted image is measured across the optical tissues of the eye at a first plane. A conversion algorithm is applied to the data, converting it to corrective optical power data that can be used as a basis for constructing a treatment for the eye at a second plane.

Embodiments of the invention pertain to a method for producing a spectacle lens with optimal correction across the entire lens taking into account the patient's complete measured wavefront. Specific embodiments can also take into account one or more additional factors such as vertex distance, SEG height, pantoscopic tilt, and use conditions. The lens wavefront can be achieved by optimizing a corrected wavefront, where the corrected wavefront is the combined effect of the patient's measured wavefront and the lens wavefront. The optimization of the corrected wavefront can involve representing the measured wavefront and the lens wavefront on a grid. In an embodiment, the grid can lie in a plane. During the optimization, a subset of the grid can be used for the representation of the measured wavefront at a point on the grid so as to take into account the portions of the measured wavefront that contribute to the corrected wavefront at that point on the grid.

The invention discloses a piezoelectric-driven two-degrees-of-freedom decoupling slight swing platform. The piezoelectric-driven two-degrees-of-freedom decoupling slight swing platform comprises a base, a stand column, a decoupling hook hinge, an X-axis bridge type amplification mechanism, an X-axis piezoelectric ceramic driver, an X-axis pre-tightening bolt, an X-axis hook hinge, a Y-axis bridge type amplification mechanism, a Y-axis piezoelectric ceramic driver, a Y-axis pre-tightening bolt, a Y-axis hook hinge and a working platform. The X-axis bridge type amplification mechanism and the Y-axis bridge type amplification mechanism are mounted on the outer sides of the two sides of the base. The vertex distances of the X-axis bridge type amplification mechanism and the Y-axis bridge type amplification mechanism and the base are equal, the X-axis piezoelectric ceramic driver is mounted in the X-axis bridge type amplification mechanism through the X-axis pre-tightening bolt, and the Y-axis piezoelectric ceramic driver is mounted in the Y-axis bridge type amplification mechanism through the Y-axis pre-tightening bolt. Each of the X-axis bridge type amplification mechanism and the Y-axis bridge type amplification mechanism comprises flexible hinge mechanisms symmetrically arranged on the two sides of the X-axis piezoelectric ceramic driver or the Y-axis piezoelectric ceramic driver and a beam for connecting the bridge type flexible hinge mechanisms. The X-axis bridge type amplification mechanism is connected with the working platform through the X-axis hook hinge, and the Y-axis bridge type amplification mechanism is connected with the working platform through the Y-axis hook hinge. By the adoption of the piezoelectric-driven two-degrees-of-freedom decoupling slight swing platform, the two-degrees-of-freedom decoupling precision slight swing can be achieved.

Embodiments of the invention pertain to a method for producing a spectacle lens with optimal correction across the entire lens taking into account the patient's complete measured wavefront. Specific embodiments can also take into account one or more additional factors such as vertex distance, segmental fitting height, pantoscopic tilt, and use conditions. The lens wavefront can be achieved by optimizing a corrected wavefront, where the corrected wavefront is the combined effect of the patient's measured wavefront and the lens wavefront. The optimization of the corrected wavefront can involve representing the measured wavefront and the lens wavefront on a grid. In an embodiment, the grid can lie in a plane. During the optimization, a subset of the grid can be used for the representation of the measured wavefront at a point on the grid so as to take into account the portions of the measured wavefront that contribute to the corrected wavefront at that point on the grid.

Embodiments of the invention pertain to a method for producing a spectacle lens with optimal correction across the entire lens that take the patient's complete measured wavefront into account. Specific embodiments also consider one or more additional factors such as vertex distance, intermediate power, add power, segmental fitting height, pantoscopic tilt, and use conditions. The lens wavefront can be achieved by optimizing a corrected wavefront, where the corrected wavefront is the effect of the patient's measured wavefront and / or the lens wavefront. The optimization of the corrected wavefront can involve representing the measured wavefront and / or the lens wavefront on a grid. In an exemplary embodiment, the grid can lie in a plane. During the optimization, a subset of the grid can be used for the representation of the measured wavefront at a point on the grid so that the portions of the measured wavefront that contribute to the corrected wavefront at that point on the grid are taken into account. The progressive addition lens can be utilized for distance, intermediate and reading use wherein the power progression is non-linear in any number or all of the near, intermediate, and far zones.

An apparatus for enabling corneal topography includes an attachment to align a placido disc illumination system with a camera of a mobile communication device. The placido disc illumination system generates concentric rings and reflects the concentric rings off a cornea. A portion of the reflected concentric rings are utilized to confirm vertex distance. The apparatus further comprises a memory, a processor, and computer-readable instructions in a mobile communication device. The camera captures an image of reflected concentric rings and communicates the captured image of the reflected concentric rings to an external computing device. A method for performing corneal topography utilizes a mobile computing and / or communication device, projects a plurality of peripheral concentric rings onto a subject's cornea and projects center rings onto the subject's cornea. The method further includes capturing, via a smartphone camera, an image of the projected peripheral concentric rings and the center rings.

The invention discloses a drag reduction method of thixotropic slurry, and belongs to the technical field of civil engineering. The method includes the steps: firstly, preparing the thixotropic slurry for drag reduction; secondly, placing stirred thixotropic slurry into a slurry storage tank, forming a grouting hole and connecting a grouting pipeline; thirdly, calculating grouting pressure and selecting a grouting pump; finally, performing grouting. The thixotropic slurry comprises sodium bentonite, carboxymethyl cellulose, sodium carbonate, clean water and an appropriate amount of admixture. Frictional drag of a pipe and soil is decreased by a grouting process, the vertex distance can be increased by 40%-70% after lubrication and drag reduction by the grouting process, drag of a top pipe in work can be effectively reduced, the top pipe with a large caliber and a long distance can continuously extend, and the drag reduction method has the advantages of low cost, easiness in technical implementation and high drag reduction efficiency.

Embodiments of the invention pertain to a method for producing a spectacle lens with optimal correction across the entire lens taking into account the patient's complete measured wavefront. Specific embodiments can also take into account one or more additional factors such as vertex distance, SEG height, pantoscopic tilt, and use conditions. The lens wavefront can be achieved by optimizing a corrected wavefront, where the corrected wavefront is the combined effect of the patient's measured wavefront and the lens wavefront. The optimization of the corrected wavefront can involve representing the measured wavefront and the lens wavefront on a grid. In an embodiment, the grid can lie in a plane. During the optimization, a subset of the grid can be used for the representation of the measured wavefront at a point on the grid so as to take into account the portions of the measured wavefront that contribute to the corrected wavefront at that point on the grid.

The invention provides a projection system comprising two groups of lenses, wherein the first group of lenses is provided with a first focal length used for forming a first image by focusing incident light rays, and the second group of lenses is provided with a second focal length used for projecting the first image into a second image; a lens vertex distance is spaced between the two groups of lenses and is correlative to a light path between the first group of lenses and the second group of lenses; the second focal length is less than or equal to the lens vertex distance, and the difference of the lens vertex distance and the second focal length is less than or equal to half of the first focal length. The invention also provides a lens combination.

A measure method and a measure device are provided. The measure method includes: scanning a face of a testee wearing a positioning frame to obtain pupil positions, visual directions, and a 3D face model, the 3D face model wears a positioning frame model corresponding to the positioning frame; superposing a 3D glasses reference model on the positioning frame model of the 3D face model; calculating an inner intersection point of the visual directions and the 3D glasses reference model; and calculating out a back vertex distance according to the pupil positions and the inner intersection point and calculate an angle between a lens plane line of the 3D glasses reference model and a space vertical line to regard as a pantoscopic tilt.

An interactive fit tool and methodology which may be utilized by an eye care professional to improve the efficiency and final outcome in selecting a pair of contact lenses targeted towards a specific patient visual need in the treatment of presbyopia. The interactive fit tool comprises an application which includes images that would allow a patient to decide if he or she desires balanced visual acuity, near biased visual acuity, or distance biased visual acuity. In addition, the interactive fit tool comprises fit guide tables and performs the calculations for vertex distance and spherical equivalent.

The invention discloses a blind area covering method of an underwater wireless sensor network, which belongs to the technical field of underwater wireless sensor networks. This method uses the movement of autonomous underwater vehicles to collect the monitoring data of the coverage blind area of ​​the underwater wireless sensor network. The distance between the grid center and the vertex is equal to the coverage radius of the autonomous underwater vehicle; then each grid is traversed with an appropriate strategy, so as to realize the data collection of the blind area. The algorithm overcomes the problems of complex and unknown underwater environment, diverse coverage scenarios and difficulty in reliable coverage, and at the same time minimizes the cost of autonomous underwater vehicle path movement.

The invention discloses a method for detecting spectacle lenses based on wavefront analysis. The method comprises a light source adjustment unit, a lens posture adjustment unit, a detection unit and asoftware module, wherein the light source adjustment unit is used to translate and rotate incident light; the lens posture adjustment unit is used to adjust initial vertex distances of lenses, a wearing view angle and facial radians of rings according to wearing parameters of a prescription for spectacles; the detection unit is used to detect an effective wavefront aberration of the lenses; the software module is used to set motion parameters of a motion platform and set detection parameters of a wavefront aberration sensor in the detection unit, and is used to receive, calculate and displayeffective wavefront aberration data of the detection unit. The method measures the effective wavefront aberration in high precision in a lens wearing state, and provides quantitative reference for designing and processing of the lenses and evaluation of optical properties and imaging quality.

The invention discloses a piezoelectric-driven two-degrees-of-freedom decoupling slight swing platform. The piezoelectric-driven two-degrees-of-freedom decoupling slight swing platform comprises a base, a stand column, a decoupling hook hinge, an X-axis bridge type amplification mechanism, an X-axis piezoelectric ceramic driver, an X-axis pre-tightening bolt, an X-axis hook hinge, a Y-axis bridge type amplification mechanism, a Y-axis piezoelectric ceramic driver, a Y-axis pre-tightening bolt, a Y-axis hook hinge and a working platform. The X-axis bridge type amplification mechanism and the Y-axis bridge type amplification mechanism are mounted on the outer sides of the two sides of the base. The vertex distances of the X-axis bridge type amplification mechanism and the Y-axis bridge type amplification mechanism and the base are equal, the X-axis piezoelectric ceramic driver is mounted in the X-axis bridge type amplification mechanism through the X-axis pre-tightening bolt, and the Y-axis piezoelectric ceramic driver is mounted in the Y-axis bridge type amplification mechanism through the Y-axis pre-tightening bolt. Each of the X-axis bridge type amplification mechanism and the Y-axis bridge type amplification mechanism comprises flexible hinge mechanisms symmetrically arranged on the two sides of the X-axis piezoelectric ceramic driver or the Y-axis piezoelectric ceramic driver and a beam for connecting the bridge type flexible hinge mechanisms. The X-axis bridge type amplification mechanism is connected with the working platform through the X-axis hook hinge, and the Y-axis bridge type amplification mechanism is connected with the working platform through the Y-axis hook hinge. By the adoption of the piezoelectric-driven two-degrees-of-freedom decoupling slight swing platform, the two-degrees-of-freedom decoupling precision slight swing can be achieved.

The present invention provides a light-emitting device in which even when the lens array is mounted slightly rotated from a predetermined orientation, the positional relationship between the light source and the lens part hardly shifts greatly, and the intensity distribution of light emitted from the lens array is Not easy to change. This light-emitting device includes: a substrate; a lens array having a plurality of lens portions in a matrix; and a plurality of semiconductor laser elements arranged on the substrate. Each light incident surface of the portion has a beam shape with a wider width in the column direction than in the row direction. The distance between vertices in the row direction of , and has the same curvature in the row and column directions.