43 results about "Subjective refraction" patented technology

An method for providing an objective manifest refraction of a patient's eye includes obtaining at least fourth-order Zernike wavefront aberration information, fitting a second-order only polynomial to the at least fourth-order data, and using this information to predict the patient's manifest refraction with an accuracy approaching the patient's subjective manifest refraction. A method is also described for prescribing an accurate vision correction based upon the objective manifest refraction. A display according to the invention includes higher-order wavefront aberrations, lower order wavefront aberrations, numerical indicia of predicted manifest refraction, and images of qualitative assessments of a patient's vision quality. A device for obtaining an objective manifest refraction is described.

The invention discloses a blocking effect analysis method. The method comprises the following steps: inputting a decoded image; calculating brightness differences on boundaries among pixel blocks; utilizing a blocking effect visibility function to process the brightness differences on the boundaries among the pixel blocks; utilizing a Weber-Fick inner law to calculate the subjective sensation of a human vision system to visible blocking effects; and integrating the blocking effects on all the boundaries in the image to obtain the blocking effect evaluation analysis results of the whole image. The blocking effect analysis method and the system can accurately realize the blocking effect evaluation so that results can more suit the subjective sensation of the eyes.

A device for the subjective determination of aberrations of higher orders Xi in an optical system, in particular in an eye includes at least one observation channel into which defined plates can be introduced, the individual plates having optically active structures which correspond to a defined Zernike polynomial and to a defined amplitude, at least one order Xi of the Zemike polynomial being greater than two.

Methods and devices are provided to obtain refractive correction with superior visual acuity (e.g., 20 / 10) by achieving an astigmatism-free customized refractive correction. The astigmatism-free customized refractive correction involves obtaining an objective and precise measurement of cylindrical power in a resolution between 0.01 D and 0.10 D in an eye using an objective aberrometer, reliably relating the cylindrical axis obtained from the objective aberrometer to that in a phoroptor, determining an optimized focus error of an eye through subjective refraction with a phoroptor, generating a customized refraction by combining the objective measured cylindrical power, the objective measured cylindrical axis, and the subjectively measured focus power, fabricating a custom lens with a tolerance finer than 0.09 D based on the generated customized refraction, and delivering an ophthalmic lens that can provide an astigmatism-free refractive correction for an eye.

A refraction device determines a refraction end point to provide corrective optics for a test subject. The device includes an adjustable optical system providing corrective optics to the test subject and an adjustable viewing target disposed along an optical path such as to be viewable through the adjustable optical system by a test subject. The adjustable viewing target includes a directional indicator linked synchronously to at least two choices of corrective optics presented to the test subject.

The invention provides for a subjective refractor for determining refractive error of the eye comprising an optical system for presenting at least two targets to the eye, the difference of focus between the targets greater than the predicted depth of focus of the eye; —means for indicating target preference from the presented targets; and means for determining refractive error of the eye on the basis of target preference.

An apparatus for determining the objective refraction of a patient's eye includes a transparent window and a wavefront measurement device that determines aberrations in a return beam from the patient's eye after the beam passes through a corrective test lens in the apparatus. The wavefront measurement device outputs an instant display representative of the quality of vision afforded the patient through the test lens. The display can be a representation of a Snellen chart, convoluted with the optical characteristics of the patient's vision, an overall quality of vision scale or the optical contrast function, all based on the wavefront measurements of the patient's eye. The examiner may use the display information to conduct a refraction examination and other vision tests without the subjective response from the patient.

Disclosed are a subjective and objective integrated precision optometry device and method. The device is composed of a left eye light path and a right eye light path. Each monocular eye light path comprises a human eye refraction objective measurement subsystem, a human eye refraction correction subsystem, an eyeball positioning subsystem and a subjective visual function test subsystem; each humaneye refraction objective measurement subsystem objectively measures the refractive power of the corresponding human eye to guide an inner focusing device in moving front and back along an optical axis to correct myopia or hyperopia and rotating a cylindrical mirror pair to correct astigmatism; an examinee observes a built-in sighting target through the device and moves a double-dot scribing framepart as a whole to finely tune the out-of-focus value according to subjective visual experience, the relative angle of the rotating cylindrical mirror pair is finely tuned to synthesize a light-scattering degree and an axial direction until the best subjective corrected visual quality is obtained, and the monocular subjective refraction optometry is completed. After the subjective refraction optometry of the left and right eyes is completed, the left and right eye light paths are moved in the direction perpendicular to the optical axis as a whole to adjust the pupil distance, the red-green and binocular adjustment balance process is carried out, and finally, the best precision refraction correction prescription for both eyes is given.

The invention relates to a device and a method for measuring subjective refraction. The device is used for measuring the subjective refraction of a person in near and / or medium vision, which comprises, according to the invention, for each eye of the person, a correction mounting (3) provided with at least one corrective lens, the correction mountings (3) being arranged such that the person looks through the lenses. The position of each correction mounting (3) is variable such as to adjust an angle [alpha] between the axes of the lenses.

Methods, devices, and systems are disclosed for determining refractive corrections of human eyes to reduce and eliminate image distortion associated with eyeglasses. In some embodiments, an objective refraction module is configured to measure refractive errors of an eye objectively, without subjective feedback from a tested subject. A computation module is configured to generate a plurality of objective prescriptions. A phoropter module is configured to perform a subjective refraction for determining a plurality of subjective spherical powers based on the plurality of objective prescriptions. An output module is configured to generate a plurality of prescriptions for eyeglasses, the plurality of prescriptions comprising (a) a first prescription having a first subjective spherical power fs1, a first objective cylinder power Fc1, and a first objective cylinder angle Fa1, and (b) a second prescription having a second subjective spherical power fs2, a second objective cylinder power Fc2, and a second objective cylinder angle Fa2.

A refraction device determines a refraction end point to provide corrective optics for a test subject. The device includes an adjustable optical system providing corrective optics to the test subject and an adjustable viewing target disposed along an optical path such as to be viewable through the adjustable optical system by a test subject. The adjustable viewing target includes a directional indicator linked synchronously to at least two choices of corrective optics presented to the test subject.

The invention provides a test bench for subjective evaluation and stationary testing of a vehicle, which is used for testing a manual or automatic shifting system and a clutch system of the vehicle. The test bench comprises a floor, wherein to-be-tested parts and fixing toolings of the to-be-tested parts are arranged on the floor; the to-be-tested parts comprise a seat assembly, a shifter assembly, a stay line assembly, a gearbox assembly and a clutch system; the fixing toolings of the to-be-tested parts are used for respectively fixing the corresponding to-be-tested parts on the floor according to the actual layout states of the vehicle, and simulating the operation of a driver under the driving condition of whole vehicle, so as to complete the subjective evaluation and stationary property testing of the to-be-tested parts. The test bench has the advantages that the shifting system and the clutch system under the condition of whole vehicle can be truly simulated on the test bench, and the parameters of the measuring system in the research, development and verification phase, such as shift selecting force, shifting force, shift selecting travel, shifting travel, clutch pedal force and clutch pedal travel, can be measured; the test bench is especially suitable for the preliminary development and verification phase before the prototype of the whole vehicle is produced.

The invention discloses a design method of a focal length controllable negative-refraction grating plano-concave lens. The negative-refraction grating plano-concave lens is a plano-concave lens in cylindrical symmetry, an incident surface includes a circular plane, an emitting surface includes a concave surface, the central portion of the concave surface includes a small circular plane, the concave surface including one small circular plane and multiple cylindrical surfaces and annulus surfaces with height equivalent progressive increase from inside to outside is formed, and the radius of thesmall circular plane and the sizes of the annulus surfaces are determined by that S1) the light wavelength lambda0 of the negative-refraction grating plano-concave lens is determined, a proper mediumrefractive index n is selected, the height of the cylindrical surfaces is adjusted, and thus, a negative refraction grating realizes negative refraction in the working wavelength; and S2) on the premise that incident light is input vertically, an equivalent negative refraction index neff is obtained according to the working wavelength, material refractive index and the cylindrical surface height determined in the step S1). Via the method, a preset focal length can be regulated flexibly, incident light and emitting light are focused in the same side of the normal, and energy of electromagneticwaves is more concentrated.

A wavefront device produces adjustable amplitudes in optical path differences and adjustable axis orientation angles. two substantially identical wave plates have a wavefront profile of at least the third order Zernike polynomial function which are not circularly symmetric, as denoted by Z(i,j) where i≧3 and j≠0. The wave plates are mounted in rotatable mounts with their optical centers substantially aligned with each other. An subjective wavefront refraction instrument and method are provided to correct low and high order aberrations of the eye, using the adjustable wave plates that have astigmatism and higher order Zernike function optical path difference wavefront profiles.

The present invention relates to a method for determining the defective vision of an eye of a spectacle wearer, corresponding computer program products, spectacle glass production methods and devices.The invention further relates to a spectacle glass or a spectacle glass series. The method for determining the defective vision of an eye of a spectacle wearer comprises: providing measured values from a first and a second measurement of the defective vision of the eye of the spectacle wearer; and calculating an estimated value for the defective vision of the eye of the spectacle wearer on the basis of the measured values from the first and the second measurement, measurement inaccuracies from the first and the second measurements of the defective vision being taken into account in the calculation of the estimated value of the defective vision.

Mobile computer devices and systems for refraction determination of an eye, for example for objective refraction determination and / or subjective refraction determination, are provided. Here, a display of the mobile computer device can be driven to display an image for refraction determination. The mobile computer device includes a display, a processor and a non-transitory computer-readable medium having a program code stored therein. The program code is configured to cause the processor to drive only the display to display an image thereon for determining refraction of the eye.

The invention relates to vision compensating spectacles comprising means of support (130, 140, 152) on a wearer's face and at least one optical subassembly (110, 120) mounted on the support means (130, 140, 152) opposite at least one of the wearer's eyes.The optical subassembly (110, 120) comprises three optical elements mounted on the support means in series along an optical axis: a first optical element of cylindrical power for a direction of gaze of the wearer along the optical axis, a second optical element of cylindrical power for the said direction of gaze and a third optical element of variable spherical power for the said direction of gaze.The first optical element and the second optical element are adjustable in rotation about the optical axis independently of one another.

The present disclosure describes clinical workflows, methods, and systems used to perform an indirect to direct subjective refraction to a patient with a mobile smartphone application that works as a encrypted remote administration tool in any portable electronic device and interconnect both systems via by 4G, 5G, 6G, or Wifi. According to various embodiments, an eye doctor may utilize a remote administration tool (RAT) or (RAS) remote access software application on a portable electronic device (PED) (smartphone, tablet, or laptop) to view and control the main control base (MCB) anywhere in the world to interconnect both systems. The eye doctor can perform an on-demand live subjective vision refraction via RAT technology. Furthermore, the eye doctor can control the (MCB) that can control, exam chair, digital phoropter, vision chart software, robotic phoropter arm, exam chair height, exam room lights, and near robotic chart arm anywhere in the world.

The invention relates to a myopic patient monocular spherical lens fine adjustment method which includes objective refraction, BS (British standard) value rough adjustment and BS fine adjustment. Themethod can realize refraction with precision of 5 degrees, glasses for the myopia are accurately matched with the actual dioptry of a patient, further deepening of myopia is prevented, and the methodhas advantages.

The invention relates to a comprehensive listener grade evaluation method for subjective audiometry and belongs to the direction of subjective evaluation of voice quality in the field of telecommunication technology. The method includes the following steps that 1, five listener data analysis indexes of subjective audiometry of voice quality are worked out; 2, quantification processing is conducted on the indexes through a hierarchical analysis quantification method so as to obtain the weight vector of each index; 3, a listener evaluation alternative set including excellence, goodness, medium, qualification and badness for online subjective audiometry experiments is established; 4, overall mean square values are calculated by combining the listener data analysis indexes with the weight vectors and divided into the listener evaluation alternative set. Compare with existing methods, the method has the advantages that performance of listeners participating in network audiometry experiments can be evaluated comprehensively, and therefore listeners with low evaluation grades can be rejected, and accuracy and credibility of network audiometry experiments are improved.

A subjective refraction apparatus provides a variable optical correction along an optical axis. The subjective refraction apparatus includes a pair of lenses mounted on a mount in such a manner that the lenses are movable with respect to each other in a direction perpendicular to the optical axis for generating a variable spherical power along the optical axis. The mount is provided with a support defining a space for removably receiving an additional lens on the optical axis.