An interactive display includes a display capable of generating displayed images, and first and second eyepiece assemblies each including one or more variable-focus lenses. The eyepiece assemblies, variable-focus lenses and display allow the user to perceive a virtual 3D image while providing visual depth cues that cause the eyes to accommodate at a specified fixation distance. The fixation distance can be adjusted by changing the focal power of the variable-focus lenses.

Disclosed herein are alignment features for scopes, such as alignment rings for telescopic sights. For example, a scope can includes a proximal end having an interior surface. The proximal end is that which a user aligns his or her eye in order to visualize a target. The scope may also include an alignment ring on the interior surface of the proximal end. The alignment ring assists a user in determining whether his or her eye is properly aligned with a longitudinal axis of the scope. With correct eye alignment, the alignment ring is not visible. With incorrect eye alignment, at least a portion of the alignment ring is visible, thus ensuring accurate sighting.

An optical magnifier suitable for viewing microdisplay panels and other optical fields and providing a wide field of view with minimal aberrations across the field over a large pupil with long eye-relief. The magnifier comprises six lens elements formed without the use of expensive very high dispersion glass and where the lens surfaces are spherical and/or flat. More specifically, from an eye side to object side, the magnifier has a plano-convex lens having a convex eye side surface, a negative meniscus lens with a concave surface on the eye side, a doublet having a concave eye side surface, an internal surface concave from the object side, and convex surface on the object side, a bi-convex lens, a doublet with a convex eye side surface, an internal surface convex from the object side and a flat object side surface, and a bi-concave lens. A magnifier with fewer lens elements configured to view a concave image surface is also disclosed.

A portable folding virtual reality device having a cover formed horizontally; a mounting case which is provided on a front of the cover and on which an image device such as a smart phone is mounted; a lens plate provided with a magnifying lens at a rear of the cover; and a band which is connected to both ends of the lens plate and through which the device is mounted to a head of a user. The mounting case and the lens plate are arranged to form up and downward at a right angle and to rotate by the cover and a front and rear hinges. A supporting plate that rotates left and rightward with respect to a central line of the cover is provided, and the interval between the front hinge and the rear hinge is identical to the focal distance of the left and right magnifying lens.

A system for evaluating the modulation transfer function (MTF) of a device under test is provided. The system includes an image projector configured to provide light in a pattern representing a desired image. The system further includes a lens configured to direct the provided light toward the device under test as a collimated beam. An image analysis component calculates the MTF for the device under test from the at least one image taken at the device under test and the known characteristics of the image projector and the lens.

Wafer-level optical elements and the concave spacer-wafer apertures in which they are formed are disclosed. The wafer-level optical elements include a spacer wafer comprising a plurality of apertures. Each aperture has a concave shape in a planar cross-section of the spacer wafer and an overflow region intersecting the planar cross-section. The wafer-level optical elements also include an array of optical elements, each optical element of the array being formed of cured flowable material within a respective one of the plurality of apertures. A portion of the cured flowable material forming each optical element extends into the overflow region of the respective aperture of the plurality of apertures. The spacer wafer includes a plurality of apertures, each of the plurality of apertures having a concave shape in a planar cross-section of the spacer wafer. Each of the plurality of apertures includes an overflow region intersecting the planar cross-section.

In general this device allows one to rapidly configure a mobile phone for use with a microscope. When using the device a person can take images or videos and rapidly share them, or have another user videoconference in and see the images in real time. Further, it saves both money and time when using a microscope in a laboratory (or other) setting. This device can also be used without microscope for a macro lens with illumination and light differential for purposes such as jewelry or medical examination.

A near-eye display device includes at least one projection system configured to project an image to a target position. The projection system includes an image output module, an object lens group, an aperture-coded module, and an eyepiece. The image output module is configured to provide the image. The object lens group is configured to receive lights of the image, and includes a first lens group and a second lens group. The aperture-coded module is configured to receive the lights of the image from the first lens group and send the lights of the image to the second lens group, and the aperture-coded module sequentially provides plural coded patterns, such that the object lens group converts the image into plural relay images sequentially. The eyepiece is configured to send the relay images to the target position.

An imaging lens is substantially constituted by: a negative first lens group; a positive second lens group; an aperture stop; a positive third lens group; and a negative fourth lens group; provided in this order from an object side. The first lens group is constituted only by two or more negative lenses. The second lens group has a positive lens at the most object side thereof. The third lens group has a negative lens having a concave surface toward the object side at the most object side thereof. The fourth lens group is constituted by a single negative lens. The fourth lens group moves from the object side to an image side when changing focus from an object at infinity to an object at an extremely close distance. Only the fourth lens group moves during focusing operations.

The present invention is a lightweight night vision device (NVD) sealed from environmental conditions, shielded from electromagnetic interference (EMI), and having mechanisms for easy adjustment and fixation of collimation and interpupillary distance. The NVD monocular housing is integrated with the eyepiece, image intensifier tube module, and objective, allowing collimation to be fixed via an optical alignment of the monocular housing to its eyepiece, tube module, and objective. Certain components from existing NVDs may be reused in assembling the present invention to provide cost savings.