Apparatuses or methods for determining a refractive error of an eye are disclosed. An intensity of light coming from an eye is measured, using a detector device, through at least two or at least three different apertures of the aperture device. The refractive error is then calculated based on the measured intensities.

The present invention relates to a distance measuring system. The distance measuring system comprises a distance measuring sensor, a memory unit and a processing unit. The distance measuring sensor is adapted and arranged to measure viewing distances between a subject's eyes and one or more objects. The memory unit is adapted to store the measured viewing distances in a set of measured viewing distances. The processing unit is adapted to determine a statistical distribution of the measured viewing distances from the set of measured distances.

The present invention relates to a distance measuring system. The distance measuring system comprises a distance measuring sensor, a memory unit and a processing unit. The distance measuring sensor is adapted and arranged to measure viewing distances between a subject's eyes and one or more objects. The memory unit is adapted to store the measured viewing distances in a set of measured viewing distances. The processing unit is adapted to determine a statistical distribution of the measured viewing distances from the set of measured distances.

An optometer may include a test object including a point light source and a collimator lens configured to collimate light from the point light source. The optometer may generate, for a user viewing the point light source through the collimator lens, an image of the point illumination source on a retina of an eye when the eye is in a rest position without triggering the eye to focus. A user-perceived deviation of the image of the point source from an in-focus image is indicative of visual refractive error of the user. A user may use the device with a naked eye to gauge visual refractive error of the eye or may use the device with corrective lenses to gauge the efficacy of the corrective lenses.

An optometer may include a test object including a point light source and a collimator lens configured to collimate light from the point light source. The optometer may generate, for a user viewing the point light source through the collimator lens, an image of the point illumination source on a retina of an eye when the eye is in a rest position without triggering the eye to focus. A user-perceived deviation of the image of the point source from an in-focus image is indicative of visual refractive error of the user. A user may use the device with a naked eye to gauge visual refractive error of the eye or may use the device with corrective lenses to gauge the efficacy of the corrective lenses.

The present disclosure describes a vision training device with high training efficiency for the ciliary muscle. In an example, a vision training device includes a housing having at least one eyepiece unit corresponding to an eye of a user, a display that displays a target image in front of a fixation axis of the user, a lens arranged between the eyepiece unit and the display unit, a movable unit capable of moving at least one of the display and the lens along the fixation axis, and a control unit that sets at least one training range within a movable range of the display and the lens and controls the movable unit such that at least one of the display and the lens is moved within the training range.

The present disclosure describes a vision training device with high training efficiency for the ciliary muscle. In an example, a vision training device includes a housing having at least one eyepiece unit corresponding to an eye of a user, a display that displays a target image in front of a fixation axis of the user, a lens arranged between the eyepiece unit and the display unit, a movable unit capable of moving at least one of the display and the lens along the fixation axis, and a control unit that sets at least one training range within a movable range of the display and the lens and controls the movable unit such that at least one of the display and the lens is moved within the training range.

An eye is illuminated with infrared illumination light. Illuminating the eye includes illuminating an ellipsoidal lensing structure with the infrared illumination light. A wavefront image of the reflected infrared light is generated. The reflected infrared light is the infrared illumination light reflected by a retina and exiting a pupil of the eye. The ellipsoidal lensing structure redirects the reflected infrared light to a wavefront sensor that generates the wavefront image. An accommodative eye state value is generated based at least in part on the wavefront image.

In some embodiments, a display system comprising a head-mountable, augmented reality display is configured to perform a neurological analysis and to provide a perception aid based on an environmental trigger associated with the neurological condition. Performing the neurological analysis may include determining a reaction to a stimulus by receiving data from the one or more inwardly-directed sensors; and identifying a neurological condition associated with the reaction. In some embodiments, the perception aid may include a reminder, an alert, or virtual content that changes a property, e.g. a color, of a real object. The augmented reality display may be configured to display virtual content by outputting light with variable wavefront divergence, and to provide an accommodation-vergence mismatch of less than 0.5 diopters, including less than 0.25 diopters.

A system for controlling at least one focus aspect of adaptive spectacles (10) having at least one electrically-tunable lens (22), the system including a housing (14), which is physically separate from adaptive spectacles (10), a display screen (16) mounted in housing (14), a sensor (19) mounted in housing (14) and configured to detect a relative position of adaptive spectacles (10) with respect to display screen (16), an interface (17) configured to communicate with adaptive spectacles (10), and a controller (15) configured to receive an input signal from sensor (19), the input signal being indicative of the relative position of adaptive spectacles (10) with respect to display screen (16) and output, in response to the input signal, a command signal for sending to adaptive spectacles (10) via interface (17) to adjust the at least one focus aspect of the at least one electrically-tunable lens (22).