Abstract: The description relates to lenses. One example can include a refraction element defining a lens axis and a registration element extending from an edge of the refraction element in a direction that is generally parallel to the lens axis.

Abstract: The description relates to lenses. One example can include a refraction element defining a lens axis and a registration element extending from an edge of the refraction element in a direction that is generally parallel to the lens axis.

Abstract: A peripheral retention device and related techniques are described. In one or more implementations, a computing device includes a housing having a display device secured thereto, the housing configured to be held by one or more hands of a user, one or more computing components are disposed within the housing, and a peripheral retention device secured to the housing. The peripheral retention device includes a flexible retractable portion that is configured to retract toward a surface of the housing and extend away from the surface of the housing to receive and retain a peripheral device between the retractable portion and the housing. The peripheral device is configured to support user interaction with a user interface output by the display device.