A chromatic-difference-free wide-angle camera for a head-mounted device, comprising a casing, a biconvex plus lens (1), and a biconcave minus lens (2). The biconvex plus lens (1) and the biconcave minus lens (2) are arranged in parallel in the casing and the biconcave minus lens (2) is closer to an object space. The biconvex plus lens (1) comprises a first surface (3) that is convex toward the object space, and a second surface (4) that has a flat edge and a center position that is convex toward an image space. The biconcave minus lens (2) comprises a third surface (5) that is concave toward the object space, and a fourth surface (6) that has a flat edge and a center position that is concave toward the image space. The biconcave minus lens (2) can move along an axis of the casing to adjust a distance to the biconvex plus lens (1), and compensate for a defocus in a zooming manner. The head-mounted device is suitable for being used with naked eyes by persons having 500 degree nearsightedness to 500 degree farsightedness. In use, a user can adjust the focal length according to his degree of nearsightedness or farsightedness to achieve a clear imaging without changing the conjugated distance between the human eyes and the screen.

An eye-strain reducing lens is characterized by an x-y-z coordinate system, and includes a distance-vision region, having a non-negative distance-vision optical power, configured to refract a light ray, directed by a source at a distance-vision region point at a distance-vision x-distance from a center of the coordinate system, to propagate to an eye-center-representative location; and a near-vision region, having a near-vision optical power that matches the distance-vision optical power within 0.5 D, configured to refract a light ray, directed by the source at a near-vision region point at a near-vision x-distance from the center of the coordinate system, to propagate to the same eye-center representative location, wherein the near-vision x-distance is smaller than the distance-vision x-distance.

An off-axis curvature center lens is characterized by an x-y-z coordinate system of the convergence-reducing lens, the off-axis curvature lens comprising a distance-vision region with a non-negative distance-vision optical power, having a front distance-vision surface with a center of front distance-vision curvature, and a rear distance-vision surface with a center of rear distance-vision curvature and a near-vision region with an optical power within 0.5D of the distance-vision optical power, having a front near-vision surface with a center of front near-vision curvature, and a rear near-vision surface with a center of rear near-vision curvature; wherein at least one of an x-coordinate of the center of front near-vision curvature is nasal relative to an x-coordinate of the center of front distance-vision curvature, and an x-coordinate of the center of rear near-vision curvature is temporal relative to an x-coordinate of the center of rear distance-vision curvature.

Head wear type automatic flip glasses include a housing, front automatic flipping lenses, rear fixing lenses, a transmission system, a circuit control system and a head fixing member. The front automatic flipping lenses are connected with the housing in a flipping way; the rear fixing lenses are in fixed connection with the housing. The front automatic flipping lenses are disposed in front of the rear fixing lenses. The transmission system and the circuit control system are configured in the housing. The head fixing member is located on the housing. The circuit control system controls the driving of the transmission system which is used for controlling the flipping of the front automatic flipping lenses. The head wear type automatic flip glasses are worn on the head to perform trainings. The front automatic flipping lenses flip automatically, so there is no need for hand-holding or manual flipping. That contributes to the integration of the flip training with reading and writing. Hence, it's more helpful for persistent training, which can predict better training effects.

A progressive multifocal contact lens and producing method thereof are provided. The progressive multifocal contact lens includes a first optical region of a front optical surface and a second optical region of a back optical surface. The first optical region includes a center zone, an outer zone and an intermediate zone connected between the center zone and outer zone where the center zone and outer zone are selected from a distance vision power and a near vision power and the intermediate zone is configured to adjust the optical power of the distance vision power and the near vision power so that the optical power or add power of the first optical region on the front optical surface forms a normal cumulative distribution function.

The present invention relates to a progressive addition lens and to a method for manufacturing the same. A lens comprises a rear surface intended to face an eye of the user and a front surface opposite to the rear surface. The present invention is particularly related to defining the rear surface of the lens. The present invention shows that it is possible to enhance image quality by using rotational symmetry in combination with a predefined progression curve to thereby avoid astigmatic imaging and also substantially reducing the effects of spherical aberration, coma, curvature of field and distortion.

Apparatuses, systems and methods for providing improved intraocular lenses (IOLs), include features for reducing side effects, such as halos, glare and best focus shifts, in multifocal refractive lenses and extended depth of focus lenses. Exemplary ophthalmic lenses can include a continuous, power progressive aspheric surface based on two or more merged optical zones, the aspheric surface being defined by a single aspheric equation. Continuous power progressive intraocular lenses can mitigate optical side effects that typically result from abrupt optical steps. Aspheric power progressive and aspheric extended depth of focus lenses can be combined with diffractive lens profiles to further enhance visual performance while minimizing dysphotopsia effects. The combination can provide an increased depth of focus that is greater than an individual depth of focus of either the refractive profile or the diffractive profile.

Apparatuses, systems and methods for providing improved intraocular lenses (IOLs), include features for reducing side effects, such as halos, glare and best focus shifts, in multifocal refractive lenses and extended depth of focus lenses. Exemplary ophthalmic lenses can include a continuous, power progressive aspheric surface based on two or more merged optical zones, the aspheric surface being defined by a single aspheric equation. Continuous power progressive intraocular lenses can mitigate optical side effects that typically result from abrupt optical steps. Aspheric power progressive and aspheric extended depth of focus lenses can be combined with diffractive lens profiles to further enhance visual performance while minimizing dysphotopsia effects. The combination can provide an increased depth of focus that is greater than an individual depth of focus of either the refractive profile or the diffractive profile.

Apparatuses, systems and methods for providing improved intraocular lenses (IOLs), include features for reducing side effects, such as halos, glare and best focus shifts, in multifocal refractive lenses and extended depth of focus lenses. Exemplary ophthalmic lenses can include a continuous, power progressive aspheric surface based on two or more merged optical zones, the aspheric surface being defined by a single aspheric equation. Continuous power progressive intraocular lenses can mitigate optical side effects that typically result from abrupt optical steps. Aspheric power progressive and aspheric extended depth of focus lenses can be combined with diffractive lens profiles to further enhance visual performance while minimizing dysphotopsia effects. The combination can provide an increased depth of focus that is greater than an individual depth of focus of either the refractive profile or the diffractive profile

Methods of designing at least one progressive ophthalmic lens for a user having a dominant eye and a non-dominant eye are provided. These methods include determining a first inset for a lens for the dominant eye, and determining a measurement of phoria of the user. The methods further include determining a second inset for a lens for the non-dominant eye depending on the first inset and on the measurement of phoria, and designing the lens for the non-dominant eye according to the second inset. Systems, computer systems and computer program products suitable for performing these design methods are also provided. Progressive ophthalmic lenses designed according to said design methods are also provided.