A virtual reality headset includes multiple illumination sources emitting light towards a user's eye and an image capture device capturing light reflected by the user's eye. The image capture device captures images of light from the illumination sources reflected by the user's corneas when the user looks at a specific location in the virtual reality headset. Based on locations of light having at least a threshold intensity in the captured images, the position of the center of user's eye's pupil is determined in three dimensions and used to determine a distance between the center of user's eye's pupil and a reference point relative to the illumination sources. Distances between centers of pupils of the user's eyes and reference points are used to determine a distance between the centers of the pupils of the user's eyes and a distance from the corneas to an optical system of the headset.

A distance measuring device for human body features is provided. The device comprises: an image capturing unit configured to capture a plurality of groups of human images of at least one part of human body in a time interval; an image processing unit configured to analyze to recognize a plurality of feature points in each group of the human images to generate three-dimensional coordinates for each feature point; and a processing unit configured to calculate a distance between a first feature point and a second feature point, calculate a deflection angle for each group of the human images, and generate a weight value. The processing unit has a weighted average calculation based on the weight values and the distances to generate a measurement result.

Disclosed is a method for determining a parameter of an optical equipment including an optical lens including permanent markings and being mounted in a spectacle frame, including: positioning the optical equipment is before a pattern in a first position; positioning a portable electronic device including an image acquisition module in a second position so as to acquire an image showing together the pattern seen through at least part of the optical lenses of the optical equipment in the first position and at least part of the spectacle frame of the optical equipment in the first position; detecting the permanent marking on the optical lens using the image acquired by the image acquisition module of the portable electronic device in the second position; and determining at least one parameter of the optical equipment based on the position of the permanent marking.

A visual performance examination device includes an image data obtaining unit that obtains image data of the right eye and image data of the left eye of a test subject who is irradiated with a detection light emitted from a light source; a position calculating unit that, based on the image data of the right eye, calculates first-type relative position data indicating the relative position between the pupil and the corneal reflex of the right eye, and, based on the image data of the left eye, calculates second-type relative position data indicating the relative position between the pupil and the corneal reflex of the left eye; and an evaluating unit that, based on the first-type relative position data and the second-type relative position data, outputs evaluation data about the visual performance of the test subject.

A system and method for determining the measurements needed to fabricate prescription eyeglasses. The system and method take into account how the frames fit naturally on the head and how the person's posture orients the head and alters the line of sight through the lens of the eyeglasses. A sensor unit is provided that is attached to the eyeglass frames. The individual then wears the eyeglass frames and moves through at least one situational simulation. The sensor unit generates data that corresponds to changes in orientation. The data is used to determine how a person's line of sight is altered by the anatomy of the face and the posture of the head.

Methods and systems for assessing and/or treating visual disorders, such as discorder in accommodative ability and/or vergence ability, of a person are provided. Assessment and training exercises can be performed utilizing a computerized system in communication with a head-mountable display (HMD), such as a virtual or augmented reality display, which can display visual targets at various vergence and accommodative demands. Lenses, such as inverted bifocal lenses, may be used in combination with the HMD to mimic natural accommodative demand during viewing or to enable assessment and treatment of accommodation disorders. Corrective factors can be calculated and utilized for generation of visual targets to account for lens characteristics and/or interpupillary distance mismatch. Accommodation and vergence responses can be tracked during display of the visual targets at the various demands, and assessed in comparison to normalized values for assessment of vision disorders or utilized to track progress of user in treatment of a vision disorder.

A method comprises: disposing a physical landmark upon an eye of a user; capturing at least one image of the eye of the user with an image sensor while the eye is illuminated, wherein the image includes an image of the physical landmark and at least one other point on the surface of the eye outside of the cornea; processing the at least one image to obtain at least one metric of the eye of the user; and determining, based on the at least one metric, at least one parameter of a daily use contact lens to be worn on the eye of the user.

Systems and methods for assessing vision and correcting vision problems are provided. A head-mountable virtual reality display controlled via a computing device can be worn by a user to display virtual reality images to the user. The images can be displayed as part of an interactive and engaging activity that can be used to determine a value of a certain parameter of the user's eyes. The activity can also be intended as a treatment procedure during which user's eyes are trained to perceive objects having certain properties that unassisted eyes of the user are normally not able to perceive. User input is acquired to determine user's perception of the displayed virtual reality images. The computing device can be a smartphone configured to perform the vision tests or treatment under control of a remote computing device operated by a trained clinician.

Disclosed is a measurement method for determining a value of a visual correction need for near vision of an individual in a natural posture for near vision. A recognizing limit distance is determined so that the individual is able to recognize at least one predetermined symbol farther than the limit distance relatively to the individual and unable to recognize the at least one predetermined symbol closer to the individual than the limit distance. A portable medium displaying the predetermined symbol is displaced in front of the face and eyes of the individual to change a frontal distance between his/her eyes and the portable medium and in which when a recognizing limit distance is detected by the individual, the limit distance is measured and the value of the visual correction need is determined from the measured limit distance, wherein the visual correction need includes an accommodation compensation need.

Methods of designing at least one progressive ophthalmic lens for a user having a dominant eye and a non-dominant eye are provided. These methods include determining a first inset for a lens for the dominant eye, and determining a measurement of phoria of the user. The methods further include determining a second inset for a lens for the non-dominant eye depending on the first inset and on the measurement of phoria, and designing the lens for the non-dominant eye according to the second inset. Systems, computer systems and computer program products suitable for performing these design methods are also provided. Progressive ophthalmic lenses designed according to said design methods are also provided.