49 results about "Central vision" patented technology

A lens is provided that is capable of preventing or slowing the progression of myopia when worn by a person. The lens has a power profile that reduces on-axis and off-axis hyperopic defocus created by the optics of the eye by creating on-axis and off-axis myopic defocus. The on-axis and off-axis myopic defocus is created by providing light rays that pass through a central vision region of the optical portion and light rays that pass through a peripheral region of the optical portion an increase in positive (plus) power. The overall effect is to prevent or slow the progression of myopia without any perceptible degradation in the person's central vision.

A contact lens (10) for use in controlling or retarding the progression of myopia in an eye has a central optical zone (20) approximating the normal diameter of the pupil of the eye (22) that gives clear central vision at distance for the wearer. An annular peripheral optical zone 24 that is substantially outside the diameter of the pupil is formed around the central optical zone (20) with greater refractive power than that of the central zone (22) so that oblique rays entering the eye through the peripheral optical zone (24) will be brought to focus at a focal plane that is substantially on or anterior to the peripheral region of the retina. Preferably, the rear surface (16) of the lens is shaped to conform to the cornea of the eye and the front surface (18) of the lens (10) is shaped to provide—in conjunction with the rear surface (16)—the desired optical properties of the central and peripheral optical zones. The front surface (18) is also preferably contoured to form a smooth transition (30) between the junction of the central optical zone (20) and the peripheral optical zone (24), with or without designed optical properties such as progressive power.

A method, system, and processor-readable medium for non-invasive visual compensation for a person suffering from central vision impairment. Digital images of a target field of view can he obtained and processed to generate processed images thereof, wherein central regions of the digital images that normally would reach an impaired portion of a retina of the person are moved to other regions of the target field of view. The processed images can be presented to the person such that the central regions are now directed at an unimpaired peripheral portion of the retina of the person.

A hybrid optical system for a head wearable display includes a central vision lens and a peripheral vision lens. The central vision lens approximately aligns with a cornea of a user to provide lensing to a central vision of the user when the user is looking straight forward. The peripheral vision lens, different than the central vision lens, provides lensing to an extended field of view that extends angularly beyond the central vision lensed by the central vision lens when the user is looking straight forward. The peripheral vision lens is disposed around the central vision lens. The peripheral vision lens has a co-incident optical center with the central vision lens but the central vision lens is offset from a physical center of the peripheral vision lens.

A machine-implemented method includes obtaining input data and generating output data. The status of at least one contextual factor is determined and compared with a standard. If the status meets the standard, a transformation is applied to the output data. The output data is then outputted to the viewer. Through design and/or selection of contextual factors, standards, and transformations, output data may be selectively outputted to viewers in a context-suitable fashion, e.g. on a head mounted display the viewer's central vision may be left unobstructed while the viewer walks, drives, etc. An apparatus includes at least one sensor that senses a contextual factor. A processor determines the status of the contextual factor, determines if the status meets a standard, generates output data, and applies a transformation to the output data if the status meets the standard. A display outputs the output data to the viewer.

Systems and methods are provided for improving overall vision in patients suffering from a loss of vision in a portion of the retina (e.g., loss of central vision) by providing an enhanced toric lens which redirects and/or focuses light incident on the eye at oblique angles onto a peripheral retinal location. The intraocular lens can include a redirection element (e.g., a prism, a diffractive element, or an optical component with a decentered GRIN profile) configured to direct incident light along a deflected optical axis and to focus an image at a location on the peripheral retina. Optical properties of the intraocular lens can be configured to improve or reduce peripheral errors at the location on the peripheral retina. One or more surfaces of the intraocular lens can be a toric surface, a higher order aspheric surface, an aspheric Zernike surface or a Biconic Zernike surface to reduce optical errors in an image produced at a peripheral retinal location by light incident at oblique angles.

A method implemented by computer means for calculating by optimization an optical system for example an ophthalmic lens according to at least one criterion among the following list consisting of: ocular deviation, object visual angular field in central vision, image visual angular field in central vision, pupil field ray deviation, object visual angular field in peripheral vision, image visual angular field in peripheral vision, prismatic deviation in peripheral vision, magnification in peripheral vision, lens volume, magnification of the eyes, temple shift, or a variation of preceding criteria.

A pattern VEP system for screening for glaucoma and other optic nerve related diseases/deficiencies. The system combines high contrast and low contrast testing. The low contrast testing allows for highly sensitive glaucoma testing and the high contrast allows for a sensitive test of the central vision. The system also includes a narrowly tailored method of rejecting corrupted data allowing the system to selectively salvage useful portions of a signal. The system also provides a method of data modeling to locate the N75-P100-N135 complex in a waveform and determine if it falls within the normal range

A machine-implemented method includes obtaining input data and generating output data. The status of at least one contextual factor is determined and compared with a standard. If the status meets the standard, a transformation is applied to the output data. The output data is then outputted to the viewer. Through design and/or selection of contextual factors, standards, and transformations, output data may be selectively outputted to viewers in a context-suitable fashion, e.g. on a head mounted display the viewer's central vision may be left unobstructed while the viewer walks, drives, etc. An apparatus includes at least one sensor that senses a contextual factor. A processor determines the status of the contextual factor, determines if the status meets a standard, generates output data, and applies a transformation to the output data if the status meets the standard. A display outputs the output data to the viewer.

A method of determining binocular performance of a pair of spectacle lenses comprises: a eyes characteristics providing step, a pair of spectacle lenses providing step, a environment providing step, a binocular performance criteria selecting step, and a binocular performance criteria determining step, wherein the at least one binocular performance criterion is selected among one or a combination of the following criteria groups consisting of central vision criteria group and/or peripheral vision criteria group.

Lenses and methods are provided for improving peripheral and/or central vision for patients who suffer from certain retinal conditions that reduce central vision or patients who have undergone cataract surgery. The lens is configured to improve vision by having an optic configured to focus light incident along a direction parallel to an optical axis at the fovea in order to produce a functional foveal image. The optic is configured to focus light incident on the patient's eye at an oblique angle with respect to the optical axis at a peripheral retinal location disposed at a distance from the fovea, the peripheral retinal location having an eccentricity between −30 degrees and 30 degrees. The image quality at the peripheral retinal location is improved by reducing at least one optical aberration at the peripheral retinal location. The method for improving vision utilizes ocular measurements to iteratively adjust the shape factor of the lens to reduce peripheral refractive errors.

The invention discloses a recognition method for automatically detecting the position of a lifting lug. The method comprises the steps of carrying out OpenCV-based camera calibration on a camera for an imaging model of the camera and carrying out distortion correction on a collected image; through taking Microsoft Visual Studio 2010 as an algorithmic compilation platform and combining an OpenCV2.4.9 open source image library, developing a detection and recognition algorithm for the mounting position of the lifting lug of a pressure vessel; processing an image of the lifting ear to obtain the contour of the lifting lug and the coordinate of the center point of the lifting lug; and analyzing and processing the data. The method has the advantages that according to the design algorithm, the maximum error of the coordinate point is 2.5mm and the minimum error can be up to 0.1mm; by analyzing the relationship between the data and the image, when the position coordinate of the lifting lug atthe central vision field of the camera is more inaccurate and is more deviated from the center position, the obtained coordinate error is larger; and through the method disclosed by the invention, theposition coordinate of the lifting lug can be found.

The invention relates to an amblyopia vision increase treatment method and the system, which combines the modern visual physiology research results on the basis of the traditional after-image vision increase therapy, the invention can allow patients to organically integrate the direct stimulation of a characteristic light source on the vision and the indirect stimulation of the sound signal on the visual cortex by the eyes-hands-brain cortex combined space perception and the central vision fixation training actions on the light, sound, electric and data controlled technical lever, so as to strengthen the synchronous activities of the input cortex cells of the amblyopia eye, further to relieve the suppression of the vision on the brain cortex level, promote vision development and finally realize the effective treatment of amblyopia. The clinical observations of 2 years show that the improved after-image vision increase therapy is an amblyopia treatment method which is safe, reliable and good in efficacy, and the invention especially has the treatment effect which is significantly better than other methods for the non-center watch type and other refractory amblyopia. The system can not only greatly improve efficacy, but also improve the working conditions of the medical staff and enhance working efficiency.

The invention provides a multi-area contact lens with a property of controlling progression of myopia and an application method of the multi-area contact lens. The multi-area contact lens comprises alens body, wherein the lens body comprises a myopia correction area, a myopia treatment area and a connection area for fixing wearing of the contact lens, the myopia correction area is an area capableof completely correcting myopia vision, and the myopia treatment area is an area capable of generating myopic defocusing along the peripheral retina. The multi-area contact lens with the property ofcontrolling the progression of the myopia and the application method of the multi-area contact lens have the advantages that the front surface of the lens body is provided with rotationally symmetrical multi-area aspheric surface/ spherical surface profiles so that the use of the aspheric surface can be avoided, thereby reducing the processing difficulty, surface profile parameters of all areas onthe front surface of the lens body can be adjusted flexibly, and by adjusting the size of the area and size of additional refractive power of all the areas of the lens body, the correction ability ofthe central vision and the size of provided peripheral myopic defocusing can be effectively adjusted, thereby being capable of providing personalized customization according to different individual needs.

A system is provided for determining a risk indicator for myopia. The system comprises a wearable device configured to be attached to a body of a user. The wearable device comprises at least one distance sensor configured to determine at least a first distance value indicative of a distance between the wearable device and an object located in a central vision zone of the user and a second distance value indicative of a distance between the wearable device and an object located in a peripheral vision zone of the user. The system further comprises a control unit configured to determine, based on the first distance value and the second distance value, a risk indicator for myopia. Further, a method and a computer program product are provided.

The invention discloses an out-of-focus surface type myopia prevention and control lens which comprises a lens body with a refraction surface, and the lens body is provided with a horizontal meridianand a vertical meridian. An optical area of the lens body is divided into a central vision area and a peripheral defocusing vision area, the central vision area is an asymmetric optical focusing area,and the peripheral defocusing vision area is divided into an upper defocusing area and a lower defocusing area by a horizontal meridian. The upper defocusing area is symmetrically distributed about the vertical meridian, the lower defocusing area is an asymmetric optical defocusing area, and the defocusing amount changes of the left side and the right side are different. And the luminosity distribution changes of the horizontal meridian and the vertical meridian are different. The lens body is provided with the central visual area and the peripheral out-of-focus visual area, a clear visual field can be formed in the central fovea of the retina through the change of luminosity distribution, myopia out-of-focus is formed around the retina, and the progress of myopia can be delayed and controlled.