30 results about "Spherical equivalent" patented technology

A system for replicating a standardized visual acuity test, such as the 20′ Snellen test may comprise a binocular viewer attached to a smartphone. A binocular viewer may comprise a housing comprising a pair tube covers having voids allowing for viewing through a pair of lens tubes with each lens tube in visual communication with a second lens a first lens an aperture and a front cover. The optical systems use an artful combination of front and back lens surfaces, demagnification and other systems to faithfully replicate the sight lines perceived by a user of a traditional 20′ test. The system also allows for the incorporation of other tests conducted with both eyes including Color Sensitivity and Contrast, furthermore by placing a deformable, tunable lens between the second lens and the eye the device serves as an ophthalmic refractometer, allowing a Spherical Equivalent refraction estimate for each eye.

A spectacle lens includes: a near region corresponding to near vision, wherein a spherical equivalent power at a point located on a principal line of fixation in the near region is larger than the spherical equivalent power in a region away from the point toward the nose, in a horizontal direction with reference to a spectacle wearer but smaller than the spherical equivalent power in a region away from the point toward the ear in the horizontal direction.

The invention discloses a method for measuring bubbles in a water body. The method comprises a bubble image identification process, a non-spherical bubble equivalent particle size conversion process and a bubble particle size inversion calculation process. By use of the bubble image identification process, bubble images and suspension images in the water body can be accurately distinguished from each other, and accurate bubble contours are obtained. By use of the non-spherical bubble equivalent particle size conversion process, errors in an equivalent conversion process can be reduced, and the calculation precision of equivalent spherical bubble particle sizes is improved. By use of the bubble particle size inversion calculation process, physical dimensions of bubble particle sizes are generated through combination of image calibration and inversion calculation. The precision is high, the real-time performance is good, original-position real-time measurement of physical parameters of the bubbles can be realized, and the method is suitable for wide application in such fields as scientific research, teaching, seawater monitoring and the like.

A method for estimating and tracking refractive error progression of an individual includes estimating a percentile of Spherical Equivalent Refraction (SPHEQ) as a function of at least the individual's age by comparison to a reference population; estimating an expected SPHEQ trajectory over a future predetermined period of time; comparing the expected SPHEQ trajectory with the reference population; and comparing the expected SPHEQ trajectory with an expected SPHEQ trajectory using an ametropia control treatment, thereby showing a possible treatment benefit over the predetermined period of time.

The invention discloses an indirect acting fuel metering device, which comprises a pipeline delivery system, a high temperature oval gear flowmeter system, an equivalent valve metering system and an indirect equal pressure differential valve control system. The invention has simple structure, small opening stroke, effectively reduces steady-state error, and is an indirect-acting fuel metering device with high reliability; in addition, the high-temperature oval gear flowmeter system is adopted, and the control precision is high, which is not affected by external factors. Second, the spherical equivalent valve metering system is matched with the indirect equal pressure valve control system to control the oil pressure and flow of the fuel; at the same time, the fuel flow control mainly relies on the differential pressure valve to control the process of the main piston, thereby changing the oil inlet. The input flow rate of the metering valve can stabilize the pressure difference before and after the metering valve. In this way, the opening stroke of the pressure difference valve is small, which can effectively reduce the steady-state error. It can be widely used in aero-engines that require high precision.

The invention discloses a method for converting equivalent grain size of a non-spherical bubble. The method comprises the following steps: calculating a coordinate of the center of mass for each bubble contour, establishing a plane right angle coordinate system with the center of mass as an origin of coordinates, separately calculating the numbers of pixels corresponding to radiuses in an X-axis direction and a Y-axis direction of the bubble contour and separately marking as rx, ry; separately selecting the rx and ry as the number of pixels rz corresponding to a radius in a Z-axis direction of a spatial right angle coordinate system of the bubble contour, calculating the volumes of two ellipsoids in accordance with an ellipsoid calculation formula, and solving a mean value of the volumes of the two ellipsoids as the volume of the non-spherical bubble; calculating the equivalent grain size of the non-spherical bubble by using a spherical volume formula. According to the invention, the method can implement 3D equivalent volume calculation of a 2D micro non-spherical bubble image, and can reduce errors in the course of equivalent conversion, increase precision of volume calculation, and further increase precision of equivalent spherical bubble grain size.

A photosensitive image-forming element comprising on a support at least one photosensitive layer containing silver halide crystals internally doped in the center of the crystal volume with a transition metal complex while satisfying equation (I): 0<FORM<10+5(I) where and where d1 represents a spherical equivalent diameter (SED), expressed in mu m, corresponding with a central crystal part doped with the said transition metal complex, d expressed in mu m represents the SED of the whole crystalvolume, while Q represents the concentration of the transition metal complex, expressed in 10-9 mole per mole of silver halide and wherein the said transition metal complex has the following general formula (1): [MXnYmLq]r-(1) wherein: M represents a metal selected from the group consisting of an element from Group 5 up to Group 10 of the Periodic System of the Elements; X and Y, which are different from each other, each represents one of the elements from the group consisting of Cl, Br and I; L represents any anorganic or organic ligand but preferably a ligand selected from the group consisting of NO, NS, OH, H2O, CN, CO, CH3CN, CNS, NCS, NO2, F, SeCN, CNSe, TeCN, CNTe, OCN, CNO, N3 and COO; n and m each equals an integer having a value from 0 to 6 while n+m equals 4, 5 or 6; q equals 0, 1 or 2 while n+m+q=6 and r equals 1, 2, 3 or 4.

The invention relates to the technical field of mobility electrophoresis and discloses a mobility electrophoresis based method for measuring the size of a material. The method comprises using an injection pump to inject a buffer solution into a sampling end of a capillary tube, maintaining for a first period of time, then using a sampling pump to inject a sample solution into the sampling end of the capillary tube, using the injection pump to inject the buffer solution into the sampling end of the capillary tube again after finishing sampling, applying a separation voltage between the two endsof the capillary tube at the same time; using a detector to detect a detection window of the capillary tube, acquiring the appearance time tM of a neutral marker and the appearance time t of a sample; acquiring a characteristic curve of the equivalent sphere radius of the sample, further acquiring the ionic equivalent sphere radius R of the sample; acquiring the ellipse reconstruction limit curveof the sample according to the ionic equivalent sphere radius R of the sample, and further acquiring the conformation distribution of the sample under the experiment condition. The operation of the method is convenient, the analysis speed is fast, and the analysis can be conducted together with the separation of the mixture.

A system for replicating a standardized visual acuity test, such as the 20′ Snellen test may comprise a binocular viewer attached to a smartphone. A binocular viewer may comprise a housing comprising a pair tube covers having voids allowing for viewing through a pair of lens tubes with each lens tube in visual communication with a second lens a first lens an aperture and a front cover. The optical systems use an artful combination of front and back lens surfaces, demagnification and other systems to faithfully replicate the sight lines perceived by a user of a traditional 20′ test. The system also allows for the incorporation of other tests conducted with both eyes including Color Sensitivity and Contrast, furthermore by placing a deformable, tunable lens between the second lens and the eye the device serves as an ophthalmic refractometer, allowing a Spherical Equivalent refraction estimate for each eye.

A system for replicating a standardized visual acuity test, such as the 20' Snellen test may comprise a binocular viewer attached to a smartphone. A binocular viewer may comprise a housing comprisinga pair tube covers having voids allowing for viewing through a pair of lens tubes with each lens tube in visual communication with a second lens, a first lens, an aperture and a front cover. The optical systems use an artful combination of front and back lens surfaces, demagnification and other systems to faithfully replicate the sight lines perceived by a user of a traditional 20' test. The system also allows for the incorporation of other tests conducted with both eyes including Color Sensitivity and Contrast, furthermore by placing a deformable, tunable lens between the second lens and theeye the device serves as an ophthalmic refractometer, allowing a Spherical Equivalent refraction estimate for each eye.

There is provided a progressive addition lens capable of improving both of astigmatism and power error on a peripheral part of a distance area, including a distance area used for a distance vision, and other area different from the distance area, wherein at least one of an eyeball side surface of a wearer and an object side surface in the progressive addition lens is formed into an aspheric form, and when a prescription value T to be obtained from formula “S+C/2” expressed by a prescribed spherical power S and a cylindrical power C, is minus, the area where a power deviation ΔD of a spherical equivalent power D from the prescription value T goes negative, exists on principal sight line in the distance area.

The present invention is a neutral cylinder refractor, which is a refractor that uses spherical power in combination with cylinder lenses to render them spherically neutral. Every cylinder lens in the refractor, excluding the Jackson Cross Cylinder, has corresponding spherical power added to it to neutralize the spherical equivalent of the cylindrical lenses. The invention can be used to measure the refractive error of a patient's eye, and specifically the cylinder aspect can be measured more easily due to a lack of interference from spherical equivalent.