141 results about "Near sightedness" patented technology

The present invention relates to laser ablation patterns to correct refractive errors of the eye (60) such as nearsightedness, farsightedness, astigmatism, and higher order aberrations of the eye (60). The laser ablation patterns used to control the laser (10) prevent induced aberrations by compensating for post-procedure epithelial smoothing. The position of laser pulses (12) is also controlled to optimize the achievement of the intended ablation pattern.

A wearable display device is described that allows the image from a semi-transparent display screen placed close to the eye to be correctly focused onto the retina while simultaneously allowing the image from the external environment to pass through the device without significant aberration. Focus of the display screen image is achieved through use of a micro-lens array between the screen and the eye, and a separate set of micro-lens arrays on the distant side of the screen in conjunction with the micro-lens array on the near side of the screen allows the external environmental image to pass through. In this manner images from the display screens can overlay the eye's usual view of the external environment. Use of micro-lens arrays that have dynamically adjustable focus properties allow for simulated three-dimensional images and corrective optics for far- or near-sightedness.

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 laser-based method and apparatus for corneal surgery. The present invention is intended to be applied primarily to ablate organic materials, and human cornea in particular. The invention uses a laser source which has the characteristics of providing a shallow ablation depth (0.2 microns or less per laser pulse), and a low ablation energy density threshold (less than or equal to about 10 mJ / cm2), to achieve optically smooth ablated corneal surfaces. The preferred laser includes a laser emitting approximately 100–50,000 laser pulses per second, with a wavelength of about 198–300 nm and a pulse duration of about 1–5,000 picoseconds. Each laser pulse is directed by a highly controllable laser scanning system. Described is a method of distributing laser pulses and the energy deposited on a target surface such that surface roughness is controlled within a specific range. Included is a laser beam intensity monitor and a beam intensity adjustment means, such that constant energy level is maintained throughout an operation. Eye movement during an operation is corrected for by a corresponding compensation in the location of the surgical beam. Beam operation is terminated if the laser parameters or the eye positioning is outside of a predetermined tolerable range. The surgical system can be used to perform surgical procedures including removal of corneal scar, making incisions, cornea transplants, and to correct myopia, hyperopia, astigmatism, and other corneal surface profile defects.

An illumination system is set forth that includes motion detector, an acoustic detector or noise amplifier, a time delay system, an illumination device such as an LED or incandescent bulb and an AC input device. The purpose is to allow children, elderly and others to sleep without a nightlight that is illuminated constantly. The device provides light only when needed by the occupant of the space or a person entering the space and is triggered by a specified level of noise or motion. Studies have shown that nearsightedness can be caused by not allowing the eyes to be in total darkness for long periods such as overnight. Current nightlights stay on all night, whereas this device turns on and off automatically allowing for long periods of darkness.

Apparatus and methods are provided for reducing or eliminating the progression of myopia, including a lens having an intentionally created aberration pattern for reducing or eliminating the progression of myopia. The aberration pattern may comprise a positive spherical aberration that produces a wavefront error in which the paracentral wavefront is disposed in front of the retina, thereby producing a signal that counters axial length growth of the eye and preventing the progression of myopia.

A laser-based method and apparatus for corneal surgery. The present invention is intended to be applied primarily to ablate organic materials, and human cornea in particular. The invention uses a laser source which has the characteristics of providing a shallow ablation depth (0.2 microns or less per laser pulse), and a low ablation energy density threshold (less than or equal to about 10 mJ / cm.sup.2), to achieve optically smooth ablated corneal surfaces. The preferred laser includes a laser emitting approximately 100-50,000 laser pulses per second, with a wavelength of about 198-300 nm and a pulse duration of about 1-5,000 picoseconds. Each laser pulse is directed by a highly controllable laser scanning system. Described is a method of distributing laser pulses and the energy deposited on a target surface such that surface roughness is controlled within a specific range. Included is a laser beam intensity monitor and a beam intensity adjustment means, such that constant energy level is maintained throughout an operation. Eye movement during an operation is corrected for by a corresponding compensation in the location of the surgical beam. Beam operation is terminated if the laser parameters or the eye positioning is outside of a predetermined tolerable range. The surgical system can be used to perform surgical procedures including removal of corneal scar, making incisions, cornea transplants, and to correct myopia, hyperopia, astigmatism, and other corneal surface profile defects.

The invention relates to a method of preventing the induction of aberrations in laser refractive surgery systems. Standard laser refractive surgery systems successfully correct low-order refractive errors (myopia, hypermetropia and astigmatism), but induce spherical aberration and, by extension, other high-order aberrations, which result in a worsening of vision quality. Said increase in spherical aberration is due to the shape of the cornea, and not inherent in the theoretical ablation profile, and, as a result, the problem is, in principle, common to all laser systems. The invention relates to a systematic method which can be used with any system and ablation profile in order to obtain a profile correction factor. The correction factor, which is specific to each system, can be applied in order to prevent the induction of spherical aberration and, in this way, improve the optical and visual quality of patients following surgery compared to surgery performed with standard systems. Moreover, the inventive method can be used to improve the production of lenses with controlled high-order aberrations using laser systems.

A method and device for flapless, intrastromal keratomileusis for the correction of myopia, hyperopia and astigmatism, i.e., for vision correction by corneal reshaping without creating a flap. Ultra-short laser pulses are used to create a temporary micro-channel extending to an end point located within the cornea. A second series of ultra-short laser pulses are then delivered to photo-ablate material in the vicinity of the micro-channel end-point. The photo-ablated material may exit through the micro-channel used to deliver the laser pulses, or via a separate micro-channel. With the micro-channel oriented substantially normal to the optical axis of the cornea, and by continuing to supply the ultra-short laser pulses in the appropriate number while moving the point of ablation along the micro-channel, the photo-ablation of the intrastromal tissue may continue in a controlled fashion and the cornea reshaped in a predetermined manner without creating a flap.

An ophthalmic lens element (100) for correcting myopia in a wearer's eye is disclosed. The lens element (100) includes a central zone (102) and a peripheral zone (104). The central zone (102) provides a first optical correction for substantially correcting myopia associated with the foveal region of the wearer's eye. The peripheral zone (104) surrounds the central zone (102) and provides a second optical correction for substantially correcting myopia or hyperopia associated with a peripheral region of the retina of the wearer's eye. A system and method for dispensing or designing an ophthalmic lens element for correcting myopia in a wearer's eye is also disclosed.

A method of slowing the progression of myopia in a person, comprises applying to the eye of the person contact lens or lenses each including a vision correction area for correcting in use the myopic vision of a wearer, and a myopic defocus area having a less negative focal power, to simultaneously present a controlled myopic defocus to the retina both when viewing in the distance and also when viewing at near. Contact lenses and their use are also claimed.

A method of slowing the progression of myopia in a person, comprises applying to the eye of the person a contact lens or lenses to mould the surface of the cornea. On removal of the lens, the shape of the corneal surface includes a vision correction area for correcting the myopic vision of the person, and a myopic defocus area having a more positive power and located within the pupil area, to simultaneously present a controlled myopic defocus to the retina both when viewing in the distance and also when viewing at near, without the lens in place on the cornea. Contact lenses and their use are also claimed.

A contact lens and a method for treating an eye with myopia is described. The contact lens includes an inner optic zone and an outer optic zone. The outer optic zone includes at least a portion with a first power, selected to correct distance vision. The inner optic zone has a relatively more positive power (an add power). In some embodiments the add power is substantially constant across the inner optic zone. In other embodiments the add power is variable across the inner optic zone. While in some embodiments the inner optic zone has a power designed to substantially eliminate lag of accommodation in the eye with myopia, in other embodiments, the add power may be higher.

A contact lens and a method for treating an eye with myopia is described. The contact lens includes an inner optic zone and an outer optic zone. The outer optic zone includes at least a portion with a first power, selected to correct distance vision. The inner optic zone has a relatively more positive power (an add power). In some embodiments the add power is substantially constant across the inner optic zone. In other embodiments the add power is variable across the inner optic zone. While in some embodiments the inner optic zone has a power designed to substantially eliminate lag of accommodation in the eye with myopia, in other embodiments, the add power may be higher.

Scanning spot locations are generated for ablating tissue using a scanning laser beam over a treatment region by taking a target function representing a desired lens profile of ablation with a basis function representing a treatment profile produced by overlapping scanning spots in a particular treatment pattern. In some embodiments, the basis function is a two-dimensional function representing a two-dimensional section of a three-dimensional treatment profile, which has symmetry with respect to the two-dimensional section extending along the treatment pattern. For example, the treatment pattern is generally straight for myopic and hyperopic cylinders, and is generally circular for myopia and hyperopia. The fit produces ablation depths for discrete scanning spots, which are used to calculate the number of pulses at each reference position along the two-dimensional section. The pulses are distributed along the treatment pattern to produce the desired overlapping effect.

An apparatus and method for preventing, controlling and / or treating vision disorders, such as eye fatigue and myopia, comprises a panel or a plurality of panels with a contrast stimulus or contrast stimuli presented to a peripheral vision or peripheral visions. A contrast stimulus may be a spatial frequency contrast, a luminance contrast, a translucency / transparency contrast, a depth contrast or a spectral contrast. The panel is configured to fit on screens, monitors, televisions, displays and the like. The panel may be adapted to fit on hats, glasses, the head, and the like. The panel may be constructed to be portable and stand alone, to be used while viewing a primary object, such as a visual display monitor, a book, or the like.

The invention relates to external oculentum for treating amblyopia, astigmatism, strabismus, myopia and visual fatigue of teenagers and a preparation method thereof. The oculentum comprises the following components: 20 to 40 parts of feather cockscomb seed, 20 to 40 parts of flower of small pipewort, 20 to 50 parts of raspberry, 30 to 60 parts of cassia seed, 25 to 50 parts of medlar, 30 to 60 parts of pale butterflybush flower, 20 to 40 parts of saffron, 20 to 40 parts of wild chrysanthemum, 30 to 50 parts of danshen root, 30 to 50 parts of largetrifoliolious bugbane rhizome, 20 to 40 parts of mint, 20 to 40 parts of storax, 30 to 50 parts of calamine, 2,000 to 3,000 parts of Vaseline, 300 to 500 parts of liquid paraffin and appropriate amount of water. The external oculentum is prepared by removing impurities from the medicinal raw materials; decocting, filtering and concentrating the medicinal raw materials; and adding the Vaseline and the liquid paraffin. The external oculentum is scientifically prepared according to compatible principle of monarch, minister, assistant and guide of Chinese medicinal theory. The external oculentum can effectively treat the amblyopia, the astigmatism, the strabismus, the myopia, the visual fatigue and ametropia of the teenagers, and has the advantages of exact curative effect and no toxic or side effects on human bodies.

This invention provides a contact lens for myopia control comprising: an object-side surface comprising a central zone, a transition zone and a peripheral zone which are concentric and have different refractive power, at least one of the three zones being aspheric; and an image-side surface; wherein the central zone provides correction power to focus a foveal image on the retina, the peripheral zone provides a myopic defocus effect by generating a para-fovea image in front of the retina, and the transition zone with one or more focuses provides a refractive power in diopter (D) ranging from +0.25 D to +8.00 D.

A binocular vision apparatus allows a patient to view objects through the apparatus with polychromatic light and monochromatic aberration correction, such that the chromatic aberration of the eye can be combined with the monochromatic aberration correction, so as to provide a more accurate determination of vision quality. The binocular vision apparatus provides left and right viewing optics that can substantially maintain the line of sight of each eye, such that objects can be viewed in a room with 3D depth perception corresponding to the distance of the object from the patient. As both near and far objects can be viewed with binocular aberration correction, the patient can alternate binocular viewing between near and far vision with chromatic aberration so as to evaluate a proposed treatment such as a presbyopia correction.

Method and systems are presented for analysing a wavefront using a spectral wavefront analyser to extract optical phase and spectral information at a two dimensional array of sampling points across the wavefront, wherein the relative phase information between the sampling points is maintained. Methods and systems are also presented for measuring an eye by reflecting a wavefront of an eye and measuring the wavefront at a plurality of angles to provide a map of the off-axis relative wavefront curvature and aberration of the eye. The phase accuracy between wavelengths and sample points over a beam aperture offered by these methods and systems have a number of ocular applications including corneal and anterior eye tomography, high resolution retinal imaging, and wavefront analysis as a function of probe beam incident angle for determining myopia progression and for designing and testing lenses for correcting myopia.

The invention belongs to the technical field of microscope imaging, relates to a high-order aberration correcting optical design for high-ametropia human eyes, and discloses a universal liquid crystal adaptive aberration correcting retina imaging system. An LCD screen is adopted for displaying a sighting target point light source, and the sighting target is designed into an E shape so that the self-adjusting effect of visibility is enhanced; and meanwhile, E-shaped micro displacement is easily controlled on the LCD screen so that the position of an imaging area can be quantitatively changed. Through the sign of a plurality of key devices, the universality of the liquid crystal adaptive system in fundus imaging is improved, the problem of difficult clear imaging of the fundus adaptive imaging technology under the condition of over 800-degree myopia or 200-degree astigmatism can be solved, and the system can acquire a high-resolution retina image on the human eye of 200-degree astigmatism.

The invention discloses a method and system for preventing myopia by monitoring the distance between eyes and a screen. The method and system for preventing myopia by monitoring the distance between the eyes and the screen is used for detecting the distance between the face of a person and the screen and capable of finding out and reminding automatically when the distance is too short, and therefore the eyesight of children can be effectively protected. According to the technical scheme, the method comprises the steps of collecting images in front of the screen; processing the collected images, identifying key characteristics on the face and calculating parameter values of the key characteristics on the face; comparing the calculated parameter values of the key characteristics on the face with corresponding preset parameter values of the key characteristics, confirming that the distance between the face and the screen is smaller than a preset distance if the parameter values of the key characteristics are larger than the preset values based on the perspective law that the object is big when near and small when far, and reminding people of the short distance.

A system and method for treating and preventing loss of visual acuity. The system comprises a vision correcting lens, such as a contact lens, having a material with a regular pattern of orientation of polarizable molecular bonds, so as to create a birefringent effect. Off-axis light rays are refracted through the contact lens so as to focus in front of the retina, whereas on-axis light rays pass through the contact lens without refraction, such that their focal point on the fovea is unaltered. In an exemplary embodiment, a contact lens of the present invention is capable of independently altering the refractive state of the eye in relation to fovea and peripheral retina so as to simultaneously correcting visual acuity while minimizing the signal for axial growth and hence myopic progression.

The invention relates to a multifunctional myopia preventing glasses including glasses legs and a glasses frame; infrared distance sensors are arranged inside the front end of the connection part of the glasses frame and the glasses legs; a data processing chip, a data storage card, a gravity sensor or a three axis gyro, a Bluetooth chip and a signal amplifier are arranged on a circuit board inside the front end of the glasses legs; the data storage card, the gravity sensor or the three axis gyro, the infrared distance sensors, the Bluetooth chip and the signal amplifier are connected with a data processing chip circuit; a storage battery is arranged inside the middle end of the glasses legs; the storage battery is connected with a circuit board circuit; telephone receiver horns are arranged inside the back ends of the glasses legs, the telephone receiver horns are connected with the data processing chip circuit; and the bottom surfaces of the glasses legs are provided with a USB interface, a control switch, LED display lights, and a Bluetooth switch. When reading posture and distance of a glasses wearer are not correct, the telephone receiver horns make a noice to suggest the glasses wearer to use correct reading posture and distance so as to achieve the effect of preventing myopia.

Contact lenses incorporate multifocal power profiles that at least one of slow, retard or preventing myopia progression. The lens includes a first zone at a center of the ophthalmic lens and at least one peripheral zone surrounding the first zone. The at least one peripheral zone has a different width and dioptric power than the first zone. The first zone and at least one peripheral zone are stepped or discontinuous. The multifocal power profile has substantially equivalent foveal vision correction to a single vision lens and has a depth of focus and reduced retinal image quality sensitivity that slows, retards, or prevents myopia progression.

The invention relates to glasses provided with myopic-prevention scieropia spherical lenses of optimal low optical aberration. The lenses, which are mainly used for myopic prevention by the 'scieropia method' widely recognized in the medical field to reduce the burden on crystalline lens for myopic prevention, can also be used for reducing the imaging distortion of presbyopic glasses. The glasses can strictly control the optical aberration, avoid imaging distortion, select the optimal design scheme according to different physiological conditions and habits of using eyes of different people, and reduce the cost for using the lenses by half. During fabrication, the optical center is not only moved inwards, but also creatively moved downwards (quantitative), so that a round lens can be cut into two lenses needed by a pair of glasses.

An intra-ocular refraction lens is composed of a circular optical body and at least one supporter. The curvature radius for the front surface of said optical body is determined by actual diopter. The back surface of said refraction lens appears as a concave curved surface. A method for reversibly transplanting said refraction lens into eye is also disclosed, which is suitable for the patient of high-level myopia or hyperopia.