Abstract: A head-mounted device may have optical modules that present images to a user's left and right eyes. Each optical module may have a lens support structure that supports a display and a fixed lens. Vision correction lenses may be removably coupled to the fixed lenses to help customize the head-mounted device to the vision of a particular user. A user may view images on the displays through the removable and fixed lenses from eye boxes. The optical modules may include infrared light sources that supply infrared light to the eye boxes and infrared light sensors such as infrared cameras for gaze tracking and authentication. The lenses may have optical surfaces covered with coating that enhance optical performance and may have edge surfaces that are provided with structures to help reduce stray light reflections. The lenses may be configured to pass visible and infrared light.

Abstract: Sidewall reflector structures disposed on the sidewalls of an LED or pcLED comprise a thin specular reflection layer and a light scattering layer disposed between the sidewall and the specular reflection layer. These sidewall reflector structures are more diffusively reflective than a specular reflector, yet maintain high reflectivity.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for concurrent display of applications between devices. One of the methods includes establishing full duplex communication session with a first application on a first computing device using a second application. The method includes receiving a user interface image from the first application on the first computing device. The method includes displaying the user interface image on a second user interface of the computer system. The method includes generating an overlay image including one or more annotations to the user interface image. The method also includes sending the overlay image to the first computing device.