39 results about "Subjective refraction" patented technology

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.

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.

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 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.

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.

The invention relates to a trial frame for determining the subjective refraction of a subject, comprising two lens holder devices for receiving lenses, a bridge, which adjustably connects the lens holder devices, a nose rest device having a pivotable and height-adjustable nose rest and two temples, which are adjustable in length and height, the bridge and the lens holder devices together forming a guide means for guiding the lens holder devices in the longitudinal direction of the bridge, the bridge having a spindle gear comprising a threaded spindle for adjusting the distance of the lens holder devices, wherein at least one guide protrusion is formed on each of the lens holder devices, said guide protrusion engaging into a guide groove formed in the bridge, open threaded sections being formed on each of the lens holder devices, the threaded spindle being engaged with the threaded section.

The invention discloses self-help subjective refraction intelligent wearing equipment and a lens degree calculation method. The equipment comprises a lens module, a calculation module and a control module. The lens module includes more than one set of double-sided zoom lenses, each group of two-sided zoom lens comprises two double-sided zoom lenses, and each double-sided zoom lens comprises two symmetrical and mirror-designed zoom curved surfaces; the control module drives the two groups of double-sided zoom lenses to move in a staggered way through a motor so as to realize zooming.

The invention relates to a trial frame for determining the subjective refraction of a subject, comprising two lens holder devices for receiving lenses, a bridge, which adjustably connects the lens holder devices, a nose rest device having a pivotable and height-adjustable nose rest and two temples, which are adjustable in length and height, the trial frame comprising two polarization filter devices, the polarization filter devices having a circular or a linear polariza-tion filter, a pivot for pivoting the circular or linear polarization filter in and out in front of the lens holder device, and a rotating device for rotating the polarization filter in front of the lens holder device, the polarization filter devices each being removably attachable to the lens holder devices.