31 results about "Refractive measurements" patented technology

The present invention relates to methods and apparatus to improve human ophthalmic surgery patient wellness and surgical procedural outcome of both indicated cataract surgery and elective surgeries with the implantation of permanent standard intraocular lens (IOL) and new technology intraocular lens (NTIOL). The present invention further relates to measurement of refraction intra-operatively to validate or obviate the pre-operative calculations and thus selection of the IOL or NTIOL and allow for a correction to be made intra-operatively before the permanent IOL or NTIOL is implanted. Specifically, several embodiments of the invention pertain to a disposable, temporary Proxy Lens apparatus that are used for in situ refractive measurements, an Insertion Tool apparatus to manipulate the Proxy Lens within the optical path for the refractive measurement and a Refractometer apparatus to perform the refractive measurements.

A method of precise measurement microscale refractive rate is the method of measurement the refractive of transparent and semi-transparent liquid or solid. The purpose of invention is measuring the refractive rate of transparent and semi-transparent liquid and solid medium. It accords the imaging principle of coaxial spherical optical system and measures the focal spot position of capillary with inhaling the measured liquid and gets the measured liquid's refractive rate by calculation. Select the properly capillary references according to the refractive measurement range of measured medium and then get the need of measurement precision. Example: measuring the multiple liquid medium with refractive n which is higher than 1.33 and lower than 1.48, and the standard deviation of measurement result is between 0.0002 and 0.001; the demand of sample is only 0.004ml. The sample is seal in the capillary and it is benefit to measure the microscale, toxic, irritating, effumable and inhaling liquid's refractive and also it can be used to measure the density of liquid. The invention's equipment is simple and measurement is convenience and reliable and it can be used in the research and producing department of chemical industry, medical, food, and fossil oil industry.

To provide a bi-aspherical type progressive-power lens which provides an excellent visual acuity correction for prescription values and a wide effective visual field with less distortion in wearing, by reducing a magnification difference of an image between a distance portion and a near portion. The lens is characterized in that when on a first refractive surface being an object side surface, a surface refractive power in a horizontal direction and a surface refractive power in a vertical direction, at a far vision diopter measurement position F1, are DHf and DVf respectively, and on the first refractive surface, a surface refractive power in a horizontal direction and a surface refractive power in a vertical direction, at a near vision diopter measurement position N1, are DHn and DVn respectively, relational equations,

DHf+DHn<Dvf+DVn, and DHn<DVn

are satisfied, and surface astigmatism components at F1 and N1 of the first refractive surface are cancelled by the second refractive surface being an eyeball side surface so that the first and second refractive surfaces together provide a far vision diopter (Df) and an addition diopter (ADD) based on prescription values.

The invention provides a multichannel surface plasma resonance (SPR) sensor for single-mode fiber and multi-mode fiber cascade application. The SPR sensor comprises a continuous spectrum light source 1, an eccentric single-mode fiber SPR sensor 2, a multi-mode fiber SPR sensor 3, a sensing membrane 2-1 of a cone angle structure, a reflective film 2-2 of multi-mode fiber, a sensing membrane 3-1 of multi-mode fiber, and a spectrometer 4. The SPR sensor having the cone angle structure is produced on the end of eccentric single-mode fiber by using a fiber grinding technology and a nano-gold membrane coating technology; multi-mode fiber is corroded, a gold membrane is spread to form the transmission-type multi-mode fiber SPR sensor; and the connection of the single-mode fiber and multi-mode fiber is performed in the way that light field transmission is realized by grinding one end of the multi-mode fiber and plating the reflective film 2-2. The multichannel SPR sensor has wavelength division multiplexing characteristic, sensitivity after cascade is not reduced, binary channel liquid refractive measurement is realized, and the sensor has important meaning for analytes detection, background refractive index interference elimination, and temperature self-reference.

Systems for performing combined phoropter and refractive measurements to ascertain the aberrations present in the eye of a subject. The systems use a pair of phoropter wheel assemblies, one for each eye, each assembly comprising a number of lens wheels incorporating the series of lenses and wedges required to compensate for a range of refractive vision aberrations. The vision of each eye is corrected by a combination of a subjective phoropter measurement, iteratively performed with an objective wavefront analysis measurement to determine the residual aberrations existing after the initial phoropter correction. The system is able to automatically align the axes of each wavefront analyzer with is corresponding eye, by means of centering the pupil image in the wavefront analyzer camera, and to determine the pupil distance. By changing the focusing point on the wavefront analyzer of the light refleeted from the eye, the corneal profile can be measured.

The invention discloses a refractometer capable of measuring the accommodation power of a lens. The refractometer is simple in structure and convenient to measure. The refractometer comprises a casing, a diopter measuring module and a fixation module, the fixation module forms a fixation optical path for human eyes to stare at, the fixation module comprises an arranged visual target plate and a fixation lens group, the visual target plate is provided with a visual target for observation of the human eyes, and the visual target plate is movably disposed on the casing along an optical axis of the fixation optical path; the casing is provided with a window right against the fixation optical path for the human eyes to stare at; the refractometer has a first measurement state and a second measurement state, and in the first measurement state, the visual target is located in the fixation optical path and has a first distance from the window to acquire a first image of the hyperopia diopter of the corresponding lens; in the second measurement state, the visual target on the visual target plate is located in the fixation optical path and has a second distance from the window to acquire a clear second image of the myopic diopter of the corresponding lens; the first distance is greater than the second distance.

The invention relates to a lens refractive index measuring device and method, the device comprises a diopter measuring module, an optical thickness measuring module, a confocal reflection measuring module and a measured lens, the diopter measuring module comprises a first light source module, a first collimating lens, a Hartmann diaphragm and a photoelectric detector Cam; the optical thickness measurement module comprises a second light source module, a second collimating lens, a third light source module, a third collimating lens, a focusing lens, a first beam splitter, a second beam splitter, a third beam splitter, a fourth beam splitter, a reflector, a photoelectric detector D1 and a photoelectric detector D2. The confocal reflection measurement module comprises a luminous source, a photoelectric detector D3, a Y-shaped optical fiber, a lens group and a mesoporous prism, the Y-shaped optical fiber comprises a first port, a second port and a third port, the device reduces the number of optical elements, simplifies the optical structure, is convenient to operate, reduces the cost, and reduces the space occupied area of the device.

Systems and methods for capturing intraoperative biometry and/or refractive measurements include a sensor or valve associated with the eye and configured to detect a pressure of the eye. The system also includes an intra-op diagnostics device including a control unit arranged to actuate the intra-op diagnostics device to capture the intraoperative biometry and/or refractive measurements when the sensor or valve detects pressure within a predetermined pressure range.

The invention discloses a lens refractive index measuring device which comprises a diopter measuring module, a confocal reflection measuring module and a measured lens. The diopter measuring module isused for detecting the diopter of a measured lens, the confocal reflection measuring module is used for detecting the confocal reflection positions of the upper surface and the lower surface of the measured lens. According to the measuring device, the lens refractive index of the measured lens can be obtained, the lens does not need to be damaged, operation is easy, and detection is rapid; and the device is suitable for refractive index measurement of common lenses, aspheric lenses, cylindrical lenses and other irregular surface lenses. The method for measuring the refractive index of the lens is simple to operate, rapid in detection and high in measurement precision.

Consumer products such as refraction measurement devices may be used for obtaining refraction measurements allow consumers to track their vision without visiting an optometrist or ophthalmologist. Such consumer products may work in concert with smart phones or other products having a touch screens that present images to refraction measurement devices. Smart phones may have resolution rates, sometimes measured as PPI or pixels per inch that are unknown to the user and/or refraction measurement device. On aspect of the invention is to provide an optical interface for the user to manually match the view port boundary of the smartphone to comport with the view port boundary of the refraction measurement device. Another aspect of the invention is the use of pre-distortion in images presented to the user. By noting the corrective movements exerted by the user upon the refractive measurement device, the user's own refractive error can be derived.

The present disclosure provides a refractive measurement device including: a detection light source that emits detection light; a light source lens group that emits the detection light into an eye to be detected; the imaging lens group comprises an annular light spot forming unit; the light spot image extraction mechanism is used for collecting an annular light spot image formed by the imaging lens group; and the control module is used for receiving the annular light spot image information acquired by the light spot image extraction mechanism and determining a refraction detection result. Furthermore, the invention provides a portable optometry unit. According to the refraction measuring device and the portable optometry unit, objective optometry can be achieved, the structure is compact, and refraction screening is facilitated.

The invention discloses an error-eliminating double-cylindrical-mirror astigmatism-correcting device and a subjective and objective optometry unit and relates to an ophthalmology optometry device for high-precision subjective and objective examination. In the error-eliminating double-cylindrical-mirror astigmatism-correcting device, two cylindrical mirrors are placed on a focal plane of a 4f system composed of two convex lenses respectively. Astigmatism is corrected through rotation of the two cylindrical mirrors along an optical axis; and a main optical path and two branch optical paths for subjective and objective optometry are reasonably arranged by the optometry unit. The optometry unit has advantages that an image judgment device for three-dimensional positioning of eyes and objective and subjective diopter measurements are combined into the optometry unit, a technical problem that the two cylindrical mirrors are arranged on a conjugate surface at the same time to eliminate errors is solved through a two-pupil equivalent conjugate surface structure, and diopter measurement is rapid and correction is accurate. A communication design of the main optical path and the two branch optical paths is reasonable, channel paths of the branch optical paths are short, and due to the fact that errors generated by the branch optical paths are small, objective and subjective measurement results obtained by the optometry unit are more accurate.

The invention discloses an eyesight measuring device, a control method of the eyesight measuring device and a table lamp device. The eyesight measuring device comprises a device body, a diopter measuring unit, a main control unit, a display unit and a remote controller. According to the vision measurement device and the control method, when vision detection and screening are carried out on a user, the diopter of the eyes is rapidly obtained through the diopter measurement unit, the vision screening letters are displayed through the display unit, and the user can select and determine the minimum vision screening letter which can be clearly seen finally by operating the remote controller; then the vision screening result can be displayed through the display unit, the vision screening operation can be completed at a time, and the vision screening efficiency is greatly improved. According to the table lamp device, the state parameters of the eyes can be measured in addition to learning, students, parents and the like can know the current health state of the eyes from the display unit, and health management of the eyes is facilitated.

The invention discloses an experiment device for solid refractive measurement. A light beam emitted by a semiconductor laser is radiated to a sheet-shaped solid sample through a polarization sheet; reflection light reflected by the solid sample is radiated to a long-sheet flexible solar battery and is converted to a voltage signal to output; the solid sample is placed on a rotary plate of an experiment chamber which is of a cylinder shape in order to change an incident angle of the light beam; a rotary encoder which is connected to the under of the rotary plate outputs angle information; and the solid refractivity index can be measured and the Fresnel law can be verified by cooperating with an analyzer, and the experiment device for solid refractive index measurement can be conducted in a light lab.

The invention discloses a spectacle lens refractive index measuring device and method, and the device comprises a diopter measuring element, a manual input element and a data processing element, wherein the diopter measuring element is used to measure the concave diopter D-concave and convex diopter D-convex of a spectacle lens to be measured; the manual input element is used to input the accuratediopter D-accurate of the spectacle lens to be measured; and the data processing element is used to calculate the refractive index N of the spectacle lens to be measured according to the concave diopter D-concave, the convex diopter D-convex and the accurate diopter D-accurate. The spectacle lens refractive index measuring device and method provided by the invention can quickly measure the refractive index of the spectacle lens being used by the user, are convenient for the eyeglass shop to accurately understand the refractive index of the spectacle lens being used by the customer and to introduce the customer with a more suitable refractive index new lenses, and enhance user wearing experience.

The invention discloses a modular optical measurement system. The upper surface of a mounting base plate is flat, and the upper surface of the mounting base plate is detachably and fixedly provided with the following structures: a cornea measuring device, a diopter measuring device, the Meyer ring, a scieropia target and an illuminating device; the optical paths of the Meyer ring and the diopter measuring device are provided with a spectroscope, a splitting prism and a compensating mirror in turn; the light entering from the Meyer ring enters the corneal measuring device through the spectroscope; the light of the scieropia target enters the Meyer ring through a scieropia reflector and the spectroscope; and the light of the illuminating device enters the Meyer ring through the reflector andthe spectroscope. Since the structures of the cornea measuring device, the diopter measuring device and the mounting base plate are all independent and detachable, requirement on the processing precision of the mounting base plate is low, and only a flat upper surface needs to be guaranteed. When other components are assembled on the mounting base plate, the micro-adjustment can be realized by amounting structure; and as the position is accurate, the components are relatively fixed so as to improve the accuracy of the optical path and to reduce the assembly error.