64 results about "Photopic vision" patented technology

A film suitable for use in an ophthalmic system is provided. The film may selectively inhibit blue light within the wavelength range of 400 nm to 460 nm to reduce phototoxic light to the eye while maintaining photopic vision, and may be color balanced to allow for the system into which the film is incorporated to be perceived as colorless to a viewer observing and / or using the system. The system may have a photopic and scotopic luminous transmission of 85% or more and a phototoxicity ratio of less than 80%. When used in an ophthalmic system or other system disposed between an observer's eye and a light source, the film may reduce the flux of blue light to the internal structures of the eye while reducing or minimizing dilation of the pupil.

The invention discloses a retroreflection coefficient measurement method adopting spectral correction. The retroreflection coefficient measurement method utilizes a retroreflection coefficient measurement device to realize measurement. The retroreflection coefficient measurement method comprises the following steps of adjusting the retroreflection coefficient measurement device, carrying out measurement by a spectral measurement instrument (302) to obtain relative radiation intensity spectral distribution of reflected light, correcting a human eye photopic vision function (lambda) by software to obtain relative radiation intensity spectral distribution of the reflected light at a certain geometric test angle, inputting a calibration coefficient of the spectral measurement instrument (302) into a control / processing module (5), putting a sample needing to be tested in an appointed position on a sample table (201), carrying out testing under different test geometric conditions, and carrying out correction by the calibration coefficient to obtain a retroreflection coefficient of the tested sample. The retroreflection coefficient measurement method utilizes a standard reflecting plate to realize spectral correction, greatly reduces an uncertainty component of a system, and improves accuracy and stability of measurement of a retroreflection coefficient of a retroreflection material.

This invention relates to an ophthalmic lens comprising a transparent substrate with a front main face and with a rear main face, at least one of the main faces being coated with a multilayered antireflective coating comprising a stack of at least one high refractive index layer (HI) having a refractive index higher than or equal to 1.55 and at least one low refractive index layer (LI) having a refractive index lower than 1.55, characterized in that said multilayered antireflective coating has: a mean light reflection factor in the visible region for photopic vision Rv lower than or equal to 2.5%, preferably lower than or equal to 0.9%, for at least an angle of incidence lower than 35 degrees; a mean light reflection factor in the visible region for scotopic vision Rv' lower than or equalto 0.5%, preferably lower than or equal to 0.4%, for at least an angle of incidence lower than 35 degrees.

The present invention provides a progressive power eyeglass lens and a design method thereof, improving the astigmatism of a progressive portion on a principal meridian, and widening the photopic visions of the processive portion and a near use portion when a pair of eyeglass is worn, as well as enabling the adding degree to change to the specification . A progressive power eyeglass lens includes an object side surface that includes a first progressive surface, an eyeball side surface that includes a second progressive surface, and a pair of points that is passed by a light beam passing through a rotation center of an eyeball of an eyeglasses wearer, the pair of points including a first point that exists on a principal meridian on the eyeball side surface between a progressive start point to a progressive end point, and a second point that exists on a principal meridian on the object side surface.

The invention is suitable for the technical field of an illumination spectrum, and provides a comprehensive evaluation optimization method for a light source vision and non-vision effect performance. The comprehensive evaluation optimization method comprises the following steps of obtaining a non-vision biological effect matching function c<->(lambda), a scotopic vision matching function s<->(lambda) and a photopic vision matching function p<->(lambda) according to a spectrum-sensitive curve of a non-vision biological effect C(lambda), a scotopic vision V'(lambda) and a photonic vision V(lambda); according to the c<->(lambda), the s<->(lambda) and the p<->(lambda) and the arrangement relationship of light source spectrums, obtaining radiation efficiency functions of the C(lambda), the V'(lambda) and the V(lambda), and performing unification for obtaining three stimulus values C, S and P which correspond with the C(lambda), the V'(lambda) and the V(lambda); calculating c, s and p, and establishing a CSP spectrum locus diagram according to the c, the s and the p; drawing a coordinate which corresponds with an equal-energy white and black-body radiation light source on the CSP spectrum; and drawing an S / P value spectrum and a C / P value spectrum on the CSP spectrum. According to the comprehensive evaluation optimization method, related visions are integrated and unified, thereby facilitating comprehensive performance improvement of different visions and realizing accurate calculation; and furthermore light source spectrum optimization is facilitated, thereby satisfying a requirement for required visual performance.

The invention relates to a video face replacement method based on illumination migration, and the method comprises the steps: 1, face detection and recognition: carrying out the positioning of a replaced target face faceA in a face replacement video, recognizing a face feature value, positioning a plurality of key points of a face, and determining the angle deviation information of the face; positioning the replacement face faceB, identifying a face feature value, and detecting a plurality of key points of the face; step 2, determining a transformation matrix, positioning and detecting face information of the face-changing video, extracting features, extracting features featureA, and finding out a matrix transferA which needs distortion transformation and is obtained by converting the featureA into the featureA; step 3, face replacement: carrying out transferA-based transformation on the face B, restoring the face B to a shooting angle of a face changing video to form new face information face B, and replacing the feature A by using the feature B; and step 4, illumination migration: applying an illumination migration algorithm to obtain a final result of video face replacement. Themethod can be widely applied and popularized to computer vision, visual design, digital entertainment, film production and the like.

System and methods are provided to promote effortless automatic recognition of common sight words. A subject performs a game-like task that generates novel non-verbal visual stimuli that triggers visual attention shifts that enhance foveal and parafoveal recognition of non-verbal and verbal stimuli laterally presented in the right or left visual field. The present invention engages a shared motor-perceptual-cognitive neural network involving oculomotor, visuo-motor and selective executive cognitive behaviors on both brain hemispheres. The present invention has applications to a wide range of non-verbal pre-orthographic visual processes and early lexical processes, not only contributing to enabling reading fluency to dyslexics, reluctant and slow readers, but also to beginning readers. The present invention has wide applications in learning disabilities and normative individuals learning to read.

An ophthalmic apparatus has an optical system for presenting a target to an examinee's eye through a lens, an optical system placed in an optical path of the target presenting optical system, for correcting a refractive error of the eye seeing the target, a switching unit arranged to switch an aperture size of a diaphragm, which is placed in a position substantially conjugate with a pupil with respect to the lens, between a first size corresponding to a pupil size of the eye in photopic vision and a second size larger than the pupil size in scotopic vision, an inputting unit arranged to generate a signal for switching the aperture size between the first and second sizes, and a control unit arranged to control driving of the switching unit based on the signal from the inputting unit to switch the aperture size between the first and second sizes.

This invention relates to an ophthalmic lens comprising a transparent substrate with a front main face and with a rear main face, at least one of the main faces being coated with a multilayered antireflective coating comprising a stack of at least one high refractive index layer (HI) having a refractive index higher than or equal to 1.55 and at least one low refractive index layer (LI) having a refractive index lower than 1.55, characterized in that said multilayered antireflective coating has: a mean light reflection factor in the visible region for photopic vision Rv lower than or equal to 2.5%, preferably lower than or equal to 0.9%, for at least an angle of incidence lower than 35°; a mean light reflection factor in the visible region for scotopic vision Rv′ lower than or equal to 0.5%, preferably lower than or equal to 0.4%, for at least an angle of incidence lower than 35°.

Provided is a method for improving day photopic vision and / or cone-derived visual field and visual function in a subject suffering from a retinal disease or trauma including administering to the subject a pharmaceutically effective amount of crude Dunaliella powder. Also provided is a method for improving night vision and / or rod derived visual field in a subject suffering from a retinal disease including administering to the subject a pharmaceutically effective amount of crude Dunaliella powder. A pharmaceutical composition for improving day vision and / or visual field in a subject suffering from a retinal disease including crude Dunaliella powder is also provided.

There is provided an interlayer film for laminated glass with which any of the anti-glare property, light resistance and visibility in a dark place of laminated glass can be enhanced. The interlayer film for laminated glass according to the present invention includes a thermoplastic resin and has a ratio L′s / Ls of the relative scotopic vision luminance L′s to the relative photopic vision luminance Ls to be greater than or equal to 1.0 at the time of preparing laminated glass with two sheets of clear glass in accordance with JIS R3202 (1996), and the interlayer film for laminated glass according to the present invention preferably includes at least one kind of ingredient among a phthalocyanine compound, a naphthalocyanine compound, an anthracyanine compound and an indanthrene compound which have a maximum absorption wavelength greater than or equal to 550 nm and less than or equal to 750 nm.

The invention provides an optical imaging system and a head-mounted display device. The optical imaging system comprises a display screen and a lens group, the display screen is located on the side, away from the human eyes, of the lens set and comprises a display panel and a cover plate, the cover plate is arranged on the side, facing the lens set, of the display panel, and the thickness range of the cover plate is related to the equivalent image space focal length of the lens set, the refractive index of the cover plate and the photopic vision distance of the human eyes. The invention provides an optical imaging system and a head-mounted display device, which can enable poor display caused by foreign matters between a display screen and a lens group not to be easily perceived by human eyes.

The present invention discloses a LED health lighting evaluation method and an LED health lighting lamp based on a biological effect. The LED health lighting lamp comprises an LED light source, a driving power supply which is connected to the LED light source, a control device (3), an illuminance measurement module corrected by a spectral response function obtained based on physiological parameter change of a human body under an LED light source illuminance condition, a luminous flux measurement instrument formed by a data processing module, and a background brightness measurement module. The LED health lighting evaluation method and the LED health lighting lamp is characterized in that the LED light source with different spectral components is subjected to biological equivalence evaluation, firstly the B / P value of the LED light source with different spectral components are stored in the memory of the luminous flux measurement instrument, a photopic vision illuminance is measured, an equivalent illuminance is the product of a photopic vision illuminance value and the B / P value, and according to the biological lighting effect needs to be realized, the spectral, color temperature and brightness adjustment of the LED light source are carried out through driving the control device so as to satisfy different lighting needs.