A method, a device, and a computer program product for determining a refractive error of an eye of a user are disclosed, as well as a method for producing a spectacle lens. The method for determining includes: a) displaying an image with a spatial modulation to the user; b) optionally, recording a reaction of the user to a variation of the spatial modulation over time; c) detecting a point in time at which a perception threshold of the user is reached; and d) determining the refractive error of the user from the spatial modulation, wherein the image contains a source image with several picture elements, wherein values for an image parameter are assigned to the picture elements, and wherein the spatial modulation is generated such that the values of the image parameter determine the values of a modulation parameter of the spatial modulation in the image.

A booth, for using the Teller technique to quantify visual acuity, irrespective of a patient's verbal ability booth comprises a modular structure, making up an isolated environment for the patient to perform the acuity test through the reading of Teller cards. The patient is accommodated in a visualization area at the central portion of a movable wall sliding via wheels on rails installed on the ground and ceiling by profiles. The modular structure presents a white and opaque tone, as well as its own lighting which is controlled and proper according to the test, in front of a movable wall and coplanar to a rear wall of booth. The movable wall sliding effects the distance adjustment between the patient and the visualization area cards where the minimum distance is equivalent 38 centimeters and the maximum distance is 55 or 84 centimeters as accuracy dictates, according to the patient's features.

A system for retrofitting a legacy binocular indirect ophthalmoscope (BIO) device with a camera includes an assembly with a mechanism for attaching to a mounting bracket of the BIO device in place of a teaching mirror. The assembly houses a beam splitter, which allows a portion of light from a viewing target to enter an entrance aperture of the BIO device while reflecting another portion of the light. A positioning mechanism positions the camera such that the light that is reflected by the beam splitter is directed to and captured by the camera to generate image data providing the same view(s) of the viewing target as presented via the BIO device. The image data is stored and/or wirelessly broadcast to viewing devices. The capture/storage functionality is activated via an actuator housed with a condensing lens for the BIO device and/or via a voice control module based on recognized voice commands.

A method to self-test vision of a user for use with a handheld vision tester includes receiving image data of the user's face, determining dimensions of the user's face based on the received image data, computing a user viewing distance based on the determined dimensions, displaying a vision test based on the computed user viewing distance, receiving user input responses to the vision test, and outputting results of the vision test from the user input responses.

A processing subsystem generates perceived images from information bearing nerve impulses that are transmitted from a subject's eye(s) to a visual processing region of the subject's brain along one or more nerves in response to the subject viewing a real-world scene. The processing subsystem generates display images based on the perceived images, and controls a display device to display the display images to the subject. In certain embodiments, the processing subsystem generates the display images by manipulating or modifying the perceived images to include virtual images, and provides a type of virtual pointing on the display images that is used to invoke one or more actions.

Various methods and systems for improved anterior segment optical coherence tomography (OCT) imaging are described. One example method includes collecting a set of B-scans over a range of different transverse locations on the cornea, segmenting each B-scan to identify an anterior corneal layer and an outer edge of Bowman's layer, calculating thickness values for each B-scan by computing the distance from the anterior corneal layer to the outer edge of the Bowman's layer, combining the thickness values from the B-scans to create a polar epithelial thickness map, converting the polar epithelial thickness map to a Cartesian epithelial thickness map using a fitting method, and storing or displaying the Cartesian epithelial thickness map or information derived from the Cartesian epithelial thickness map.

Embodiments of the invention include a method to determine a binocular alignment, the method comprising: measuring a disassociated phoria of a first eye and a second eye of a patient at an apparent distance; and determining an accommodative convergence of the first eye and the second eye at the apparent distance using the measured disassociated phoria. In other embodiments, a system to determine a binocular alignment comprises a stereo display, for a projection of images for a first eye and a second eye; an accommodation optics, to modify the projection of the images according to an apparent distance; an eye tracker, to track an orientation of the first eye and the second eye; and a computer, coupled to the stereo display, the accommodation optics and the eye tracker, to manage a determination of the binocular alignment.

The visual function test device of an embodiment comprises a test subject display device and an operator display device. A target display portion displays a target image to be viewed by the test subject onto the test subject display device. A visual axis estimation portion estimates a visual axis of the test subject when the target image is viewed. A position display portion displays a display position of the test target image and a viewpoint position that corresponds to the estimated visual axis, onto the operator display device, and thus a tester can objectively recognize a gazing state of the test subject and surely perform the test, which enhances the reliability of the test.

Methods are provided for performing a surgical procedure using optical coherence tomography (OCT) including extracting lenticular material from within a capsular bag of the eye of a patient; placing a replacement lens within the capsular bag after extraction of the lenticular material from the capsular bag; acquiring a plurality of OCT images that visualize the placement of the replacement lens within the capsular bag; and determining from the plurality of OCT images a degree of contact of the posterior surface of the replacement lens with the posterior portion of the capsular bag.

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).