39 results about "Eye refraction" patented technology

A method of measuring eye refraction to achieve desired quality according to a selected vision characteristics comprising the steps of selecting a characteristic of vision to correlate to the desired quality of vision from a group of vision characteristics comprising acuity, Strehl ratio, contrast sensitivity, night vision, day vision, and depth of focus, dynamic refraction over a period of time during focus accommodation, and dynamic refraction over a period of time during pupil constriction and dilation; using wavefront aberration measurements to objectively measure the state of the eye refraction that defines the desired vision characteristic; and expressing the measured state of refraction with a mathematical function to enable correction of the pre-selected vision characteristic to achieve the desired quality of vision. The mathematical function of expression may be a Zernike polynomial having both second order and higher order terms or a function determined by spline mathematical calculations. The pre-selected desired vision characteristics may be determined using ray tracing technology.

Optical devices, systems, and methods can produce and/or measure cylindrical (as well as spherical) lens shapes throughout a range of both powers and cylindrical axes. Fluid focus lenses employ electrical potentials to vary the shape of a fluid/fluid interface between two immiscible fluids having differing indices of refractions by controlling localized angles between the interface and a surrounding container wall. Spherical power, cylindrical power, and cylindrical access alignment may be varied with no moving parts (other than the fluids).

The invention designs a model eye used for fundus detection and a using method thereof. The model eye is composed of three optical lenses, a film with a field angle scale and a resolution line pair. The model eye is the first lens, the second lens, the third lens, and the film in order from the object side to the image side. Adjacent surfaces of the first lens, the second lens, the third lens and the film are in close contact with each other, and the field angle scale and the resolution line pair are arranged on the arc surface of the front part of the film. The invention also includes a method of using the model eye. The optical structure and the refractive index difference between optical lenses or lens groups in the present invention simulate the actual refractive system of the human eye, and the field of view scale and resolution line pair carved on the film are based on the index requirements in ISO10940, and replace those in ISO10940 The method is used to detect the field of view and resolution of fundus imaging inspection medical devices represented by fundus cameras.

Device and method for determining an objective eye refraction parameter of a subject depending on a plurality of gaze directions, the device includes elements for ophthalmologically measuring an objective eye refraction parameter of a subject, and elements of visual stimulation of variable proximity and intended to stimulate the visual accommodation of the subject for first and second proximity values. The device includes opto-mechanical alignment elements for carrying out a first optical alignment of the optical axis of measurement on an eye axis in a first measuring position corresponding to a first angle of lowered viewing associated with a first proximity value to take a first measurement of an objective eye refraction parameter of the subject, and a second alignment of the optical axis of measurement on the eye axis in another measuring position corresponding to another angle of lowered viewing associated with another proximity value to take a second measurement.

The invention provides a traditional Chinese medicine disease preventative treatment monitoring system based on a fundus camera and a method. The method comprises the following steps of acquiring identity information of a patient through an identity card reader; making the fundus camera performing focusing adjustment and making the fundus camera detect the eye of the patient for acquiring refraction information of the eye; according to the refraction information of the eye, making the image sensor of the fundus camera generate local bending for acquiring an eyeground image which is adapted with eye refraction capability; detecting the pulse wave signal of the patient through a pulse diagnosis instrument, and extracting pulse manifestation characteristic parameter of the patient from the pulse wave signal; acquiring interrogation diagnosis information between a doctor and the patient from a doctor terminal; and transmitting the identity information, the eyeground image and the pulse manifestation characteristic parameter of the patient to a doctor terminal for making a traditional Chinese medicine disease preventative treatment nourishing plan according to the interrogation diagnosis information. Through the system and the method, the high-resolution eyeground image can be obtained, and accuracy in determining the traditional Chinese medicine disease preventative treatment diagnosis effect by the doctor is improved through the pulse manifestation characteristic and the interrogation diagnosis information.

The determination of magnification in an ophthalmic fundus camera image is achieved by detecting the focusing mechanism position, and using a calibration function to calculate the magnification from the focus position.

The invention discloses an image processing method for obtaining corneal vertexes. The method comprises the following steps of continuously acquiring N frames of images at a high speed to synthesize aframe of image with minimum noise; acquiring a potential corneal reflection area through image binaryzation and blob analysis so that a to-be-processed area is reduced; carrying out gray stretchingon the potential light spot area; carrying out double-threshold binarization and blob analysis; obtaining a gray gravity center and a light spot boundary coordinate of a cornea vertex area; taking a gray vertex as a center; pulling the ray outwards every a certain angle to obtain a gray sequence on the ray; carrying out gaussian fitting based on a nonlinear least square method on gray scale data of the strip ray group to acquiresub-pixel coordinate values of corneal vertexes; finally, according to the jump of the gray value on the ray at the boundary; solving a sub-pixel-level coordinate boundary; corneal vertex and light spot boundary information obtained through the method can be combined with pupil center position and other related information obtained through other devices to obtain Kappa angle Alpha angle and other related information of eyes, and reliable basic data are provided for subsequent further eye refraction parameter obtaining.

The invention relates to a medicine patch for conditioning eye refraction and a preparation method of the medicine patch. The medicine patch comprises a laminating carrier attached with a medicine, wherein the medicine is prepared from the following raw materials in parts by weight: 4-8 parts of muscone, 4-8 parts of pearl powder, 8-12 parts of cassia occidentalis, 4-8 parts of semen plantaginis, 6-10 parts of goldthread root, 6-10 parts of salviae miltiorrhizae, 4-8 parts of borneol, 6-10 parts of golden cypress, 6-10 parts of buddleja officinalis and 2-3 parts of ginger oil. The medicine patch for conditioning eye refraction disclosed by the invention is capable of clearing heat, decreasing internal heat, reducing swelling, moistening eyes and enhancing cycle, and has a good conditioning treatment effect on myopia, amblyopia and astigmatism caused by ametropia.

The invention provides retina light field display MR glasses capable of accelerating transmission of a digital pupil signal. A monocular/binocular depth shooting module is used to collect an MR data stream, a graphic image signal is generated, an image accelerated processor processes data of the graphic image signal to obtain a binary data stream, and a high-speed digital micro lens encodes and reflects/refracts the binary data stream to obtain the exit pupil. The exit pupil is refracted by a digital grating array in a binocular near-eye refraction light path and finally projected to the retina. Thus, the graphic picture signal is processed in the accelerated way, and then the high-speed digital micro lens can complete electric to optical signal conversion more timely, the data refresh rate is improved, and frames seen by the eyes feel less granular, and further, a deep digital grating in the digital grating array refracts the depth of the light signal, image projection is changed intodepth projection, and the user experience is enhanced.

The invention relates to the technical field of ophthalmology test, in particular to an intelligent ophthalmology refraction health test method. A user can conveniently perform eye refraction state detection, and doctor resource waste is reduced. The intelligent ophthalmology refraction health test method comprises the following steps of S100, obtaining a detection request of a user terminal needle in accordance with a current comprehensive refractor; S200, starting the corresponding comprehensive refractor to perform refraction inspection on the user, and obtaining the current ophthalmology refraction parameters of the user; and S300, obtaining the corresponding ophthalmology refraction parameters, enabling the obtained corresponding ophthalmology refraction parameters to be matched withthe user information of the corresponding user, performing storage, and at the same time, transmitting the stored information to the user terminal and an optometry center.

The invention relates to a shell-type spiral gradient gradual change defocusing lens which comprises a substrate layer, and a shell-type spiral inclined rectangular grating film layer is arranged on the substrate layer. The shell-type spiral inclined rectangular grating film layer comprises inclined rectangular gratings which are continuously arranged from the innermost starting point of a shell-type spiral curve to the outermost end point of the shell-type spiral curve, and the inclination angles of the inclined rectangular gratings are continuously increased from the innermost starting point to the outermost end point. And the light beams of each incident angle are continuously focused in front of the retina after entering the shell type spiral inclined rectangular grating film layer. The inclination angle of the inclined rectangular grating is continuously increased from the innermost starting point to the outermost ending point without interruption, so that the incident beams of each incident angle are continuously focused in a deceleration signal area in front of the retina, and the focusing in front of the retina is relatively concentrated; therefore, the effects of no blind area, no channel, left and right eye refraction correction and shortsightedness defocusing are achieved.

The invention discloses a refractive compensation calculation method for initial eye refractive distribution. The method comprises the following steps: acquiring the initial eye refractive distribution of eyes of a user; calculating a regulation and control surface refractive power value of the initial eye refractive distribution value, and forming regulation and control surface refractive power distribution according to the calculated regulation and control surface refractive power value; and generating refractive compensation medium processing data of the refractive power distribution of the regulation and control surface. The invention further discloses a device and a storage medium, personalized refraction compensation design is carried out on the basis of human eye personalized initial refraction distribution measurement, and human eye refraction is corrected to refraction distribution after random regulation and control through regulation and control surface design and processing of irregular refractive power distribution.

A subjective optometry apparatus has a projection optical system including a visual target presenting portion and an optical member to project a target light flux toward a subject eye, and causing the target light flux to be incident on the optical member with a deviation of the incident target light flux from an optical axis of the optical member, a housing accommodating the projection optical system, a presentation window for emitting the target light flux from the inside of the housing to the outside thereof, an eye refractive power measurement unit provided outside the housing, and holding means integrally connecting the housing to the eye refractive power measurement unit to hold the eye refractive power measuring unit. When using the eye refractive power measuring unit, a distance from the presentation window to the eye refractive power measurement unit in an optical path is equal to or less than 180 mm.