Motorized loupes enable the user to automatically increase or decrease the magnification on demand, without touching the loupes. Each loupe has a micromotor attached to it which moves a lens in the loupe to change the magnification. The motor is battery powered and the batteries are carried in a small housing worn by the user. The housing also contains electronic circuitry that at least reads the position encoders, drives the motors, receives the user's magnification commands and charges the battery when plugged in. A cord runs from each loupe to the housing to carry power and signals. The motors are controlled wirelessly by a foot pedal or by voice so that the user does not have to touch the loupes to change the magnification. In the preferred embodiment of surgical loupes, a TTL loupe is attached to each lens in a user's eyeglasses for binocular vision.

Provided is a test method performed using a lens which comes into contact with a human body during use, the test method including the steps of: providing a membrane member including a membrane swellable upon absorbing water and a supporting base having an annular shape to support an outer periphery of the membrane; allowing cells to adhere on the membrane of the membrane member; and bringing the membrane to which the cells are adhered into close contact with the surface of the lens, by immersing the membrane member and the lens into a liquid and deforming the membrane in a swollen state along the surface of the lens.

An optical element is switchable between a first state having a first focal length and a second state having a second focal length. The optical element includes a first electrode layer, an insulation layer, a resistance layer, a liquid crystal layer, and a second electrode layer, which are arranged in order. An electric resistance ratio of the resistance layer increases from a central part to a peripheral part.

An optical element is switchable between a first state having a first focal length and a second state having a second focal length. The optical element includes a first electrode layer, an insulation layer, a resistance layer, a liquid crystal layer, and a second electrode layer, which are arranged in order. An electric resistance ratio of the resistance layer increases from a central part to a peripheral part.

An optical lens intended to be placed before a wearer's eye and having a front surface and a rear surface, the rear surface being the surface intended to be the closest to the wearer's eye when the optical lens is placed before a wearer's eye, the optical lens having a mineral glass element on the front surface and further comprising an eye protector that is configured to prevent any piece of the mineral glass element from reaching the wearer's eye when the element is broken, said eye protector comprising a polymer wafer arranged on the rear surface.

An optical article may include a frame, a first active lens arrangement coupled to the frame, and a second active lens arrangement coupled to the frame. The first active lens arrangement and the second active lens arrangement may be lined up abreast with respect to each other. Further, the optical article may include a time-based optical power adjustment mechanism coupled to the first active lens arrangement and the second active lens arrangement. The time-based optical power adjustment mechanism may be configured to vary the optical power of the first active lens arrangement and the second active lens arrangement in accordance with a predetermined adjustment.

An optical device (1), comprising: —a first optical transparent thermoplastic layer (2); —a second optical transparent thermoplastic layer (3), and; in between both thermoplastic layers (2, 3); • a diffractive optical element (4) adjacent to the first thermoplastic layer (2), • a spacer (5) in between the diffractive optical element (4) and the second thermoplastic layer (3), and; • a border (6) enclosing the diffractive optical element (4) thereby forming a sealed cavity (7); wherein at least an upper part of the border (6), adjacent to the cavity (7) is formed from an adhesive (15).

A fog shield for a diagnostic ophthalmic lens is disclosed. The shield has a lens mount and an air barrier. The lens mount is configured to connect to a diagnostic ophthalmic lens. The air barrier is connected to the lens mount and extends in front of the lens mount. The air barrier is located below and in front of the diagnostic ophthalmic lens when the lens mount is connected to the diagnostic ophthalmic lens.

Examples include a device including a fluid lens having a membrane (that may be in elastic tension), a substrate, a fluid at least partially enclosed between the membrane and the substrate, and a support structure configured to provide a guide path for an edge portion of the membrane, such as a membrane attachment at a periphery of the membrane. The guide path may be configured to greatly reduce (or substantially eliminate) changes in the elastic energy of the membrane as the membrane profile is adjusted. The guide path may be configured so that the elastic force exerted by the membrane is generally normal to the guide path for each location on the guide path. Adjustment of the membrane profile may include applying an actuation force that is normal to the elastic force exerted by the membrane. Various other methods and apparatus are also disclosed.

An electrically-switchable flexible contact lens for conforming to an eye of a user is provided. The lens comprises a liquid crystal cell for changing a focal power of the contact lens, and the liquid crystal cell has a cell gap thickness between a first inner surface and a second inner surface, the liquid crystal cell comprising a diffractive optical element for correcting the vision of a user, wherein the diffractive optical element is arranged to maintain the cell gap thickness by providing support at one or more locations within the cell.