Disclosed herein are system and method for testing and analysis of visual acuity and changes using an acuity model, the acuity model generated based on one or more acuity chart design parameters and candidate acuity parameters calculated using the acuity test data of the subject, the acuity model comprising a chart-specific psychometric function determined using a family of multiple-optotype psychometric functions, and wherein the acuity model is configurable to estimate possibility of obtaining the acuity test data of the subject.

A device, a method, and a computer program for producing two point light sources of the same wavelength on a pupil plane of an eye of a user are disclosed, as well as a device, a method, and a computer program for determining a neural transfer function of the visual pathway of the user. The device for determining the neural transfer function includes a coherent light source for generating a light beam; an optical device for separating the light beam into sub-light beams, superpositioning the respective sub-light beams, and adjusting contrast and spatial phase in an interference pattern; and a beam path for guiding the superposed sub-light beams such that two point light sources of the same wavelength are produced. The devices are compact and robust, allow a variable presentation of different interference patterns, and can thus be easily operated in a commercial product in a clinical setting.

A method for performing an eye test includes the steps of: receiving a request from a user to perform the eye test; acquiring predetermined user identification data from the user; presenting or providing at least one test image to the user, the at least one test image including at least one test target contained therein; instructing the user to identify at least one of the at least one test target(s) contained within the at least one test image; acquiring response data associated with the user's attempt(s) to identify the at least one test target(s) contained within the at least one test image; aggregating and/or analysing the acquired user identification data and/or the response data utilising a test algorithm which determines result data; and, presenting or providing the result data to the user.

Disclosed herein are system and method for testing and analysis of visual acuity and changes using an acuity model, the acuity model generated based on one or more acuity chart design parameters and candidate acuity parameters calculated using the acuity test data of the subject, the acuity model comprising a chart-specific psychometric function determined using a family of multiple-optotype psychometric functions, and wherein the acuity model is configurable to estimate possibility of obtaining the acuity test data of the subject.

A device, a method, and a computer program for producing two point light sources of the same wavelength on a pupil plane of an eye of a user are disclosed, as well as a device, a method, and a computer program for determining a neural transfer function of the visual pathway of the user. The device for determining the neural transfer function includes a coherent light source for generating a light beam; an optical device for separating the light beam into sub-light beams, superpositioning the respective sub-light beams, and adjusting contrast and spatial phase in an interference pattern; and a beam path for guiding the superposed sub-light beams such that two point light sources of the same wavelength are produced. The devices are compact and robust, allow a variable presentation of different interference patterns, and can thus be easily operated in a commercial product in a clinical setting.

In some embodiments, initial feedback indicating threshold characteristics (under which a user sees initial stimuli presented on a user interface) may be provided to a prediction model, and a set of predicted characteristics (for a set of locations of the user interface) and a set of confidence scores associated with the set of locations may be obtained via the prediction model. Based on the set of confidence scores, one or more locations may be selected to be tested during a visual test presentation. As an example, the locations may be selected over one or more other locations of the set of locations based on the set of confidence scores. Based on predicted characteristics associated with the selected locations, stimuli may be presented at the selected locations during the visual test presentation. Visual defect information for the user may be generated based on feedback from the visual test presentation.

A waveguide apparatus includes a planar waveguide and at least one optical diffraction element (DOE) that provides a plurality of optical paths between an exterior and interior of the planar waveguide. A phase profile of the DOE may combine a linear diffraction grating with a circular lens, to shape a wave front and produce beams with desired focus. Waveguide apparati may be assembled to create multiple focal planes. The DOE may have a low diffraction efficiency, and planar waveguides may be transparent when viewed normally, allowing passage of light from an ambient environment (e.g., real world) useful in AR systems. Light may be returned for temporally sequentially passes through the planar waveguide. The DOE(s) may be fixed or may have dynamically adjustable characteristics. An optical coupler system may couple images to the waveguide apparatus from a projector, for instance a biaxially scanning cantilevered optical fiber tip.

A waveguide apparatus includes a planar waveguide and at least one optical diffraction element (DOE) that provides a plurality of optical paths between an exterior and interior of the planar waveguide. A phase profile of the DOE may combine a linear diffraction grating with a circular lens, to shape a wave front and produce beams with desired focus. Waveguide apparati may be assembled to create multiple focal planes. The DOE may have a low diffraction efficiency, and planar waveguides may be transparent when viewed normally, allowing passage of light from an ambient environment (e.g., real world) useful in AR systems. Light may be returned for temporally sequentially passes through the planar waveguide. The DOE(s) may be fixed or may have dynamically adjustable characteristics. An optical coupler system may couple images to the waveguide apparatus from a projector, for instance a biaxially scanning cantilevered optical fiber tip.

A contrast sensitivity measurement apparatus (1) generates a stimulating image to be output to an external display device (20) for measuring contrast sensitivity of a user. An image scale setting unit (12) determines the spatial frequency in units of pixels on the basis of an observation distance, physical characteristics of the external display device (20), and visual characteristics of a human. A carrier waveform generation unit (13) generates a luminance map in which a change of luminance along a first axis follows the spatial frequency. A contrast map generation unit (14) generates a contrast map in which contrast gradually decreases from one end to another end along a second axis, and an equal contrast line forms a given waveform. A stimulating image synthesis unit (15) generates the stimulating image by synthesizing the luminance map and the contrast map.

The present invention comprises a visual target display unit (100) which displays a visual target image (B) for causing a subject (P) to focus on a visual target region (Ba), and a light emitting unit (200) which is arranged at the front side of the visual target display unit (100) such that a first region (Ba) of the visual target display unit (100) is exposed toward the subject (P) and which emits interfering light (C) from a second region (Ca) positioned around the first region (Ba).