摘要:
A vision screening apparatus conducts a photorefraction ocular screening test to generate refractive error data. Based on the refractive error data, a Snellen equivalent is determined. An evaluated person distance from the vision screening apparatus is also determined and used to generate an adjusted optotype size. The vision screening apparatus displays the optotype, adjusted for the Snellen equivalent and the evaluated person distance.
摘要:
A computer-readable medium includes computer-executabie instructions that cause a processing unit of a user device to instruct a user to stand a predetermined distance from the user device, acquire an image of the user, and determine a user interpupiliary distance based on the acquired image. The user interpupiliary distance indicates a distance between the user's pupils in terms of pixels. The executable instructions further cause the processing unit to determine a current distance between the user and the user device based on the user interpupiliary distance, a predetermined interpupiliary distance, a width of the acquired image in terms of pixels, and a field of view of the camera. Additionally, the executable instructions cause the processing unit to display the current distance between the user and the user device on a display and display an eye chart when the determined current distance is equal to the predetermined distance.
摘要:
A pupil tracking system including a light source for illuminating a viewer's eye, an aperture located to pass light from the light source after retro-reflection from the viewer's pupil, the aperture sized and shaped to pass the light from the light source and block at least a portion of other light arriving at the aperture, and a light sensor for tracking a location of a spot produced by the light from the light source which passed the aperture. Related apparatus and methods are also described.
摘要:
An imaging system captures a plurality of images of the subject's face at each of a series of successive time periods in which a subject is looking in respective directions. Using the images for each time period, the system forms a respective skin model of a skin portion of the subject's face and obtains eye data characterizing an eye of the subject. The system uses the skin models to convert the eye data for the multiple time periods into a common frame of reference, and then uses the eye data to obtain a numerical eye model in the frame of reference indicative at least of the position of the centre of the eye's rotation (CER). Typically, such an eye model is obtained for each of the subject's eyes. The eye model is used in a process for designing an item of eyewear, or in an augmented-reality or virtual-reality system.
摘要:
Methods and systems include using a digital camera module for capturing a plurality of digital images of a tested subject at a plurality of perspective views. The tested subject is not required to move their head position or viewing direction during the capturing of images. A motion control module I) rotates the camera module with its optical axis pointing at a rotation center to correct any orientation error in capturing the perspective views, and II) positions the camera module to adjust the rotation center for accommodating different head positions of the tested subject. A computer module processes and stores the plurality of digital images to fit an eyeglass frame to the tested subject or to acquire data for fitting prescription lenses into the eyeglass frame. The computer module can provide an augmented reality of different styles of eyeglasses, and obtain 3D measurements for fitting eyeglass frames.
摘要:
The present invention concerns a method for manufacturing an intraocular ophthalmic lens intended for a patient, this method comprising the following steps: • measuring biometric data specific to the patient; • choosing a distribution of light to be obtained after correcting the patient's vision; • choosing a type of aberration to be corrected and an extent of aberration correction to be applied; • determining intrinsic parameters of the lens; • from the results of the biometric data measurements, form the type and extent of aberrations to be corrected, from the selected light distribution and from the determined parameters of the lens, calculating geometrical parameters for the lens in such a way that the set formed by the ophthalmic lens and the eye of the patient generates a light distribution specification corresponding to the chosen light distribution and to the chosen aberration corrections. The invention further concerns an ophthalmic lens obtained by said method.
摘要:
Systems and methods for assessing ocular cyclotorsion are provided utilizing an inter-aural axis location assembly, with a first gyroscope connected to the inter-aural axis location assembly, and a camera assembly for retinal imaging, with a second gyroscope connected to the camera assembly. A processor is utilized to calculate angles between the disc-foveal line, skull-horizontal axis, and earth- horizontal axis for use in determining ocular cyclotorsion, and the determinations or calculations may be used to generate a diagnostic report that may be provided via an output device.
摘要:
A multifunctional medical optical examination instrument including a hand-holdable portion, at least an optical examination head portion mountable on the hand-holdable portion and including at least optical examination and non-digitized viewing optics and image digitization, storage and transmission circuitry included in at least one of the hand-holdable portion and the at least optical examination head portion, the image digitization, storage and transmission circuitry being arranged to receive an image from at least a portion of the at least optical examination and non-digitized viewing optics.
摘要:
A portable retinal imaging device for imaging the fundus of the eye. The device comprises an ocular imaging device containing ocular lensing and filters, a fixation display, a light source, and is configured for coupling to a mobile device containing a camera, display, and application programming for controlling retinal imaging. The light source is configured for generating a sustained low intensity light (e.g., IR wavelength) during preview, followed by a light flash during image capture. The ocular imaging device works in concert with application programming on the mobile device to control subject gaze through using a fixation target when capturing retinal imaging on the mobile device, which are then stitched together using imaging processing into an image having a larger field of view.
摘要:
Systems and methods for imaging tissue are described. Particularly, systems and methods of imaging an inner limiting membrane, epi-retinal membrane, or posterior vitreous cortex of a patient's eye are disclosed. Imaging an inner limiting membrane, epi-retinal membrane, or posterior vitreous cortex may include applying a stain to the inner limiting membrane, epi-retinal membrane, or posterior vitreous cortex of the patient's eye, causing the stain to produce fluorescent light having a wavelength within a near- infrared range, capturing the fluorescent light, and producing an Optical Coherence Tomography (OCT) image of the inner limiting membrane, epi-retinal membrane, or posterior vitreous cortex with an OCT imaging system that is configured to detect light within the near-infrared range.