47 results about "Dioptric correction" patented technology

A method for optimizing a prescription for laser-ablation corneal treatment achieves the modification of wavefront-based refractive correction data with the use of user/doctor-input nomograms. Data comprising a wavefront description of a patient eye are received and displayed to a user, who can then make modifications to these treatment data. A modification is calculated based upon the desired correction to yield corrected wavefront description data, which are displayed to the user. A system includes a processor and a device for transmitting a wavefront description of a patient eye to the processor. An input device is adapted to receive a desired correction to the wavefront description data. Software is resident on the processor having code segments for implementing the calculations as described.

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.

Contrast sensitivity is an informative measure of visual function, but current tools for assessing it are limited by the attentional, motor, and communicative abilities of the participant. These participants are often less able to engage with psychophysical tasks or follow an experiment's instructions, and alternative approaches have disadvantages that limit their usefulness in clinical settings. Here, we describe an efficient new measure of contrast sensitivity—‘Curveball’—that continuously infers stimulus visibility through smooth eye tracking instead of perceptual report. The procedure rapidly lowers stimulus contrast in real time until the threshold is found. The task is repeatable, well-correlated with results from conventional psychophysical methods, and sensitive to improvements in visual acuity from refractive correction. The procedure requires minimal instruction to administer and takes only five minutes to estimate a full contrast sensitivity function (CSF), which is comparable to the best existing methods available for healthy adults. Our technique relies on a minimum level of smooth tracking ability, which could limit its usefulness for participants with specific visual impairments, and we discuss potential solutions to this problem. Overall, our findings indicate that Curveball is a promising means of accurately assessing contrast sensitivity in previously neglected populations.

A method to measure gaze tracking behavior comprising, displaying, on a display, one or more variable-contrast, variable-spatial-frequency stimuli each moving from a first location to a second location. Generating ordered sequences of stimuli (“sweeps”) that are incremented upon detected tracking behavior. Generating, by an eye-tracking monitor, a gaze position signal as the visual stimulus moves from the first position to the second position, the gaze position signal detecting a position of one or both eyes. Filtering the gaze position signal by identifying gaze position samples that are not consistent with the limitations of the human eye and/or visual system. Calculating a trajectory-match score for each stimulus on each frame from comparison of that stimulus's position to the gaze position signal over a time window. Identifying the visual function of the subject in response to the trajectory-match scores. Wherein the variable-contrast stimulus increases in contrast. Wherein the variable-contrast stimulus decreases in contrast. Wherein the variable-contrast stimulus alters in a step-wise manner by multiplying the current contrast by a variable between 0.5-1.5 on each frame. Wherein the variable-contrast stimulus is exchanged for the next stimulus in that sweep sequence. Wherein indirect progress along similar sweeps is inferred and recorded. Interpolating a contrast sensitivity function (CSF) from a set of one or more sweep sequences. Detecting, empirically, the subset of one or more sweep sequences that is most informative about the CSF for a given population.

The invention relates to an electronic diopsimeter with the functions of eyeball tracking and refraction compensation, which comprises a shell and a plane electronic visual field screen, wherein the shell is provided with a cylindrical peeping channel; the cylindrical lateral surface of the peeing channel is provided with an infrared illuminating lamp for emitting infrared rays to the eyeball of a subject; the inside of the peeping channel is connected with a refractive error correction system so as to close the inside of the shell; the refractive error correction system is provided with a non-spherical aspheric surface lens with refractive error correction; and an infrared camera for shooting the infrared ray reflected by the eyeball of the subject is also arranged in the shell. The electronic diopsimeter has the advantages of shell closure, eye ball tracking, refractive error correction and the like so that the accuracy is high. Besides, the invention also relates to a method for quantizing and evaluating the cooperation degree of the subject.

The invention discloses a use method of a refractive correction instrument. The refractive correction instrument collects eye use environment data of a user in real time; the collected environment data is compared with preset eyesight protection data and characteristic parameters of the refractive correction instrument, according to comparison results, an alarming reminding part is started or thecharacteristic parameters of the refractive correction instrument are adjusted, and a good eye use environment is provided for the user in real time; according to the eye use environment, the blinkingfrequency of eyes is controlled by a blinking control mechanism in a physical mode in real time to conduct refractive adjustment on the eyes; refractive correction time and parameters of the user arecounted by a refractive corrector, and the counted data and the correction progress and effect which are obtained through analysis according to the counted data are displayed to the user through a display unit or a projection unit; communication connection is built between the refractive correction instrument and an external client, the counted data is uploaded to the external client, and the correction progress and effect can be checked through the external client. By means of the method, the deflects which exist in the prior art are overcome, and damage caused by refractive correction to the eyes of the human body is reduced.