9 results about "Refractive measurements" patented technology

This application discloses a refractive screening instrument and its evaluation method, relating to the field of optometry technology. It includes a central processing and evaluation module; a pupil positioning and image capture module, which is signal-connected to the central processing and evaluation module. The pupil positioning and image capture module is used to lock onto the subject's eye and capture eye images to determine the pupil center reference point; and a first projection and sensing module. This application, by calibrating all measurement optical paths with the pupil center as a unified reference point, effectively eliminates alignment errors caused by micro-movements of the eyeball, ensures the consistency of multi-source data in spatial coordinates, and improves the repeatability and accuracy of measurements. This application combines basic refractive power measurement with higher-order aberration analysis, enabling not only the acquisition of conventional refractive powers such as spherical and cylindrical lenses, but also the quantitative detection of complex refractive problems such as irregular astigmatism and corneal morphological abnormalities by analyzing the distortion of the grid pattern.

This invention discloses a refractive measurement device and method for a microlens array on the surface of a spectacle lens. The refractive measurement device for the microlens array includes: a test module for accommodating a spectacle lens to be tested, the surface of which includes a microlens array; a light source module for providing a variable-aperture and collimated measurement beam; the measurement beam covers and passes through the microlens array; and a receiving module for simultaneously receiving the measurement beam after it has passed through the microlens array and obtaining its intensity distribution, determining the refractive value of each microlens based on the changes in the intensity distribution. This invention not only improves the accuracy of refractive measurement using a microlens array but also improves the measurement efficiency of the microlens array.

The application relates to the technical field of optical measurement, in particular to a mechanical-focusing-free, full-automatic, high-precision and portable lens diopter measuring device, which is characterized in that the application places a to-be-measured lens and a liquid lens coaxially in an imaging system to form an imaging system capable of adjusting total diopter through voltage. Then, the application collects a graphic sequence based on the imaging system, finds the best voltage value corresponding to the image with the largest definition, and finally substitutes the best voltage value into a pre-constructed diopter mapping model to perform relationship mapping of fusion temperature compensation and hysteresis compensation, so that the diopter of the to-be-measured lens is obtained. The liquid lens used by the application has a millisecond-level response, is matched with a high-frame-rate camera, and can complete single measurement within seconds. The lens does not have mechanical moving parts and is free of wear, has a long service life and good stability. The lens is based on an embedded system, has a small size, high integration and low manufacturing cost compared with a traditional automatic focal power meter. The measuring process and result are fully digitalized, and the lens is convenient for storage, tracing, remote transmission and further analysis.

The invention discloses a lens diopter and microstructure detection device and method based on diaphragm structure improvement, the lens diopter and microstructure detection device comprises a support table, a focusing assembly and an imaging assembly, the focusing assembly and the imaging assembly are both installed on the support table, a nested Hartmann diaphragm is installed on the imaging assembly, and the Hartmann diaphragm is installed on the support table. The lens to be measured is arranged between the nested Hartmann diaphragm and the focusing assembly, the optical axes of the nested Hartmann diaphragm, the lens to be measured, the focusing assembly and the imaging assembly are located in the same plane, and the nested Hartmann diaphragm comprises a microstructure observation area and a diopter measurement area nested in the middle of the microstructure observation area. A micropore array is arranged on the diopter measuring area, and a green light blocking film is arranged on the surface of the diopter measuring area. According to the invention, the problems of low detection efficiency and large manual error due to the adoption of multi-device operation in existing focal power detection and microstructure analysis can be solved.

The invention discloses an optical system for diopter measurement and a diopter measurement instrument, and relates to the technical field of diopter measurement. The optical system for diopter measurement comprises a projection light path and a measurement light path, the projection light path further comprises a projection light source, a diaphragm and a digital micro-mirror array shared by the measurement light path, the projection light source, the diaphragm and the measurement light path are sequentially arranged, the digital micro-mirror array comprises a plurality of micro-mirrors, each micro-mirror can independently deflect and has a first deflection state and a second deflection state, and the first deflection state and the second deflection state are different. The micro-reflector in the first deflection state can reflect a projection light beam projected by the diaphragm to the steering beam combiner, and the micro-reflector in the second deflection state is located on the path of the measurement light path; wherein the plurality of micro-reflectors in the first deflection state are matched to form a pixel pattern, and the plurality of micro-reflectors can be switched between the first deflection state and the second deflection state, so that the pixel pattern is changed to zoom a projection light path. According to the technical scheme provided by the invention, the measurement precision of the diopter is improved.

The invention relates to the technical field of optical measurement, in particular to a full-automatic, high-precision and portable lens diopter measuring device without mechanical focusing, and aims to coaxially place a to-be-measured lens and a liquid lens in an imaging system to form the imaging system capable of performing voltage regulation on total diopter. And then acquiring a graph sequence based on an imaging system, and finding an optimal voltage value corresponding to the image with the maximum definition. And finally, substituting the optimal voltage value into a pre-constructed diopter mapping model to execute relational mapping fusing temperature compensation and hysteresis compensation to obtain the diopter of the to-be-measured lens. The liquid lens used in the invention has millisecond-level response and cooperates with the high-frame-rate camera, so that single measurement can be completed within a second level. No mechanical moving part exists, abrasion is avoided, the service life is long, and stability is good. Based on an embedded system, the size is small, the integration level is high, and the manufacturing cost is lower than that of a traditional automatic lensometer. The measurement process and result are fully digitalized, and storage, tracing, remote transmission and further analysis are facilitated.

The embodiment of the invention discloses a diopter measurement system and method and a related device. The diopter measurement system comprises a watching assembly, an illumination assembly, a scanning assembly, an imaging assembly and a measurement assembly, wherein the scanning assembly is used for adjusting the angles of telecentric light and scattered light entering the eyes of a user, receiving fundus reflected light of the eyes of the user, adjusting the emergent angle of the fundus reflected light and guiding the fundus reflected light to the measuring assembly; the imaging assembly is used for carrying out iris imaging on the human eyes of the user, determining the central position of the human eyes of the user and determining cornea curvature related parameters of the human eyes of the user through cornea reflected light; and the measuring assembly is used for generating infrared light, guiding the infrared light to the scanning assembly, emitting the infrared light to the human eyes of the user through the scanning assembly, receiving infrared reflected light of the human eyes of the user to the infrared light, and determining related parameters of the diopter of the human eyes of the user according to the infrared reflected light. In this way, refraction measurement at different angles is achieved, and meanwhile the function of measuring relevant parameters of the human cornea curvature is integrated.

The application provides a method and device for determining the diopter of a tunable optical device and the optical device, comprising: performing interference removal processing on an initial point cloud subset of a polymer layer to obtain a target point cloud subset; determining a center region warping amount of an effective polymer layer region based on the target point cloud subset; and determining the diopter of the tunable optical device according to the center region warping amount. Thus, due to the elastic deformation of the polymer layer caused by the change of the driving voltage, the curvature radius of the polymer layer and the diopter will change. After the elastic deformation of the polymer layer, the three-dimensional point cloud data of the film layer is analyzed to obtain the center region warping amount of the effective polymer layer region, and finally the diopter is calculated according to the center region warping amount and a mapping function. The whole process can be realized by only one three-dimensional topography measuring device, the measurement cost is low, the diopter of all tunable optical devices can be measured, and the overall quality of the tunable optical device is ensured.

The invention relates to a retina peripheral defocus detection method and system in the technical field of optical detection, and the method comprises the following steps: driving a moving lens to a preset fogging position, and guiding a user to perform fogging relaxation; keeping a fogging relaxed state, and controlling the mobile lens to execute diopter scanning from a preset fogging position according to a preset step length; controlling the movable lens to axially move within the diopter measurement range at a preset step length, acquiring an image stack after each axial movement to obtain a second image sequence, performing registration processing, identifying center coordinates of all projection light spots, and delimiting a region of interest; calculating a definition evaluation value in each region of interest, and calculating a spherical power; according to the method, astigmatism degree calculation and astigmatism angle calculation are carried out to obtain astigmatism degrees and astigmatism axial positions, the astigmatism degrees and the astigmatism axial positions are mapped to a retina coordinate system, a continuous retina peripheral defocus topographic map is output, and the problem that an existing peripheral defocus detection method excessively depends on fundus natural textures, so that peripheral measurement precision is poor is solved.