Systems and methods for implementing head mounted displays may include lens movement assemblies. A head mounted display system includes a display housing surrounding one or more display devices, a first lens and a second lens. An input device on the display housing includes a control member moveable between a first position and a second position. A lens movement assembly is operatively coupled to the input device and the first and second lenses and is configured to move the first lens relative to the second lens in response to movement of the control member between the first position and the second position.