A system and method for detecting a condition of an augmented reality system and/or controlling an aspect of the augmented reality system.

An optical device for a head-mounted display device includes a first partial reflector and a second partial reflector positioned relative to the first partial reflector so that the second partial reflector receives first light transmitted through the first partial reflector and reflects at least a portion of the first light toward the first partial reflector as second light. At least a portion of the second light is reflected by the first partial reflector as third light, and at least a portion of the third light is transmitted through the second partial reflector. At least one of the first partial reflector or the second partial reflector includes a reflective holographic element.

A display apparatus that can surely make an image reach an observer's pupil without imposing a burden on the observer. The apparatus includes: an eyepiece optical system; and an image display apparatus including an image forming apparatus and a transfer optical system. The eyepiece optical system and the image display apparatus are spatially separated from each other, the eyepiece optical system forms an image from the transfer optical system on a retina of an observer, the image display apparatus further includes a first position detection apparatus that detects a position of the eyepiece optical system, a second position detection apparatus that detects a position of a pupil of the observer. On the basis of detected positional information of the eyepiece optical system and the pupil, the transfer optical system is controlled such that the image incident from the image forming apparatus reaches the eyepiece optical system.

The invention relates to a remote sensing device comprising a detector with a predefined field of view (FOV); and an emitter emitting pulses of light with an overall divergence angle θ.sub.div in the retinal hazard region which further comprises at least one diffuser wherein the divergence angle after the diffuser is θ.sub.0; and at least one lens configured to transform the light from said diffuser to a determined divergence angle matching the FOV of the detector, or to a virtual image of predefined size appropriate in magnitude given the divergence in order to ensure the most restrictive position regarding eye-safety to be at the same position for pulsed and (quasi-)continuous wave operation; and to emit the transformed light. The invention further discloses a smartphone comprising such a remote sensing device characterized by its improved eye-safety properties for myopic people.

An observation optical system according to the present invention includes a Fresnel lens and a lens LP with a positive refractive power provided on a light incident side or a light emitting side of the Fresnel lens. A length in a direction of an optical axis from a surface vertex of a central annular section of the Fresnel lens to an end portion of the central annular section is defined as h0, and a length in the direction of the optical axis of a grating wall surface of a first annular section adjacent to the central annular section is defined as h1. The lengths h1 and h0 are set to appropriate values, respectively.

An observation optical system according to the present invention includes a Fresnel lens and a lens LP with a positive refractive power provided on a light incident side or a light emitting side of the Fresnel lens. A length in a direction of an optical axis from a surface vertex of a central annular section of the Fresnel lens to an end portion of the central annular section is defined as h0, and a length in the direction of the optical axis of a grating wall surface of a first annular section adjacent to the central annular section is defined as h1. The lengths h1 and h0 are set to appropriate values, respectively.

In general, one aspect disclosed features a computer-implemented method comprising: obtaining a first metric of a physiological aspect of a patient, the first metric obtained at a first time by a head-wearable apparatus while the head-wearable apparatus is worn by the patient; obtaining a second metric of the physiological aspect of a patient, the second metric obtained at a second time by the head-wearable apparatus while the head-wearable apparatus is worn by the patient, wherein the second time is later than the first time; determining a value for a parameter of the head-wearable apparatus based on the first metric and the second metric; and setting the parameter in the head-wearable apparatus to the determined value for the parameter.

In general, one aspect disclosed features a computer-implemented method comprising: obtaining a first metric of a physiological aspect of a patient, the first metric obtained at a first time by a head-wearable apparatus while the head-wearable apparatus is worn by the patient; obtaining a second metric of the physiological aspect of a patient, the second metric obtained at a second time by the head-wearable apparatus while the head-wearable apparatus is worn by the patient, wherein the second time is later than the first time; determining a value for a parameter of the head-wearable apparatus based on the first metric and the second metric; and setting the parameter in the head-wearable apparatus to the determined value for the parameter.

A video display control apparatus receives a video content generated by a control target device in accordance with a control operation of a user via a network and displays the received video content on a head mount display attached to the user. The video display control apparatus includes a detection unit that detects a change in a direction of face or line of sight related to the control operation and a first display control unit that generates an auxiliary pattern in which at least one of a display position and a display form changes so as to follow the detected change in the direction of the face or the line of sight related to the control operation, superimposes the auxiliary pattern on the video content, and displays the video content on the head mount display.

Provided is an optical glass that contains TiO.sub.2 and/or Nb.sub.2O.sub.5 as components of a glass composition, achieves a high light transmittance, and has excellent mass productivity. An optical glass contains TiO.sub.2 and Nb.sub.2O.sub.5 in a total amount of 20% by mole or more as components of a glass composition and has a basicity of 12 or more.