Abstract: A head-mounted device may include optical assemblies for presenting images to a user. The optical assemblies may each have a display for generating an image and a lens that presents the image to a corresponding eye box for viewing by a user. The optical assemblies may have lens barrels. Each lens barrel may have a first end to which a display is mounted and may have an opposing second end. A mount may be used to attach the lens to the second end of the lens barrel. The mount may have at least one flexure. The flexure may have a U-shaped cross-sectional shape. The mount may have a ring-shaped flexure that extends around a peripheral edge of the lens, may have flexure segments, or may have a set of three discrete flexures located at different positions along the edge of the lens.