Abstract: One aspect of the disclosure provides a binocular viewing system. In one embodiment, the binocular viewing system includes a binocular viewer and a computer. The binocular viewer has left and right display screens and a variable focal depth optical subsystem located in an optical path between and separate from the display screens and a user when the user uses the binocular viewer. The computer is configured to provide control signals to the binocular viewer. The control signals are operable to place images on the left and right display screens and vary a focal depth of the variable focal depth optical subsystem. The images include a plurality of objects controlled by the variable focal depth optical subsystem to make at least one of the plurality of objects appear closer to the user and at least one of another of said plurality of objects appear farther away from the user.

Abstract: In an embodiment of the disclosure, there is provided a handheld vision tester for vision self-testing by a user. The handheld vision tester comprises a touchscreen display and a control. The touchscreen display is configured to present different shapes, either statically or dynamically, to the user for the vision self-testing. One of the different shapes may be a modulated version of another similar shape displayed at the same time. The modulated version of the another similar shape includes a modulated edge. The control is configured to allow a user to trigger operations of the tester and allow the user to select, with the touchscreen display, one of the different shapes. The handheld vision tester is configured to determine results of the vision self-testing from the user selections.

Abstract: One aspect of the disclosure includes a method to assess vision function. In one embodiment, the method comprises providing a sequence of test images on a display (106) to a test subject (102) during a stimulus interval and providing a response pattern image for each of the sequence of test images during a response interval after the stimulus interval. Each of the sequence of test images includes multiple stimulus patterns (304, 306) arranged around a fixation target (302). The response pattern image includes multiple response targets (320), each of which corresponds to a location of each of the multiple stimulus patterns (304, 306). One (304) of the multiple stimulus patterns (304, 306) differs. An assessment of a vision function of the test subject (102) is based on a selection by the test subject of one of the multiple response targets (320) that the test subject indicates corresponds to a location of the multiple stimulus pattern that differs (304).

Abstract: In one aspect, there is provided an embodiment of a calibration system for use with a vision tester having a display. In this particular embodiment, the calibration system comprises a calibration stand and a reflective surface. The calibration stand is configured to hold the vision tester. The reflective surface is coupled to the calibration stand and is oriented substantially parallel to the display. The calibration stand is configured to hold the display of the vision tester at a fixed distance from the reflective surface.

Abstract: A binocular viewer, a method of measuring and training vision that uses a binocular viewer and a vision measurement and training system that employs a computer to control the binocular viewer. In one embodiment, the binocular viewer has left and right display elements and comprises: (1) a variable focal depth optical subsystem located in an optical path between the display elements and a user when the user uses the binocular viewer and (2) a control input coupled to the left and right display elements and the variable focal depth optical subsystem and configured to receive control signals operable to place images on the left and right display elements and vary a focal depth of the variable focal depth optical subsystem. In another embodiment, the binocular viewer lacks the variable focal depth optical subsystem, but the images include at least one feature unique to one of the left and right display elements.

Abstract: A handheld vision tester and a method of self-testing vision of a user of the handheld vision tester are provided. The method ensures that a display of the handheld vision tester is within an acceptable distance to eyes of the user. Variations of the acceptable distance are compensated for. The method further displays different shapes, either dynamically or statically, on the display to the user. The method also allows for input to the handheld vision tester by the user in response to the different shapes displayed. Results of the self-test are determined from the inputs to the handheld tester by the user.

Abstract: In one aspect, there is provided a handheld vision tester comprising a display, cursor control, interface port, and camera. The display delivers a series of images making up vision tests to a user who interacts with the vision tests by using the display and cursor control of the handheld vision tester. The camera verifies the user is taking the vision tests. The results of the vision tests are stored in the handheld communication device. The interface port allows for communication of the stored results of the vision tests with external devices. In another aspect, there is provided a calibration system for the handheld vision tester. The calibration system includes a stand to hold the handheld vision tester and a reflective surface substantially parallel to a display of the handheld vision tester.