Variable-focus lenses are arranged as a lens pair that work on opposite sides of a see-through optical combiner used in a mixed-reality head-mounted display (HMD) device. An eye-side variable-focus lens is configured as a negative lens over an eyebox of the see-through optical combiner to enable virtual-world objects to be set at a close distance. The negative lens is compensated by its conjugate using a real-world-side variable-focus lens configured as a positive lens to provide for an unperturbed see-through experience. For non-presbyopes, the powers of the lenses are perfectly offset. For presbyopes, the lens powers may be mismatched at times to provide simultaneous views of both virtual-world and real-world objects on the display in sharp focus. Responsively an eye tracker indicating that the user is engaged in close viewing, optical power is added to the real-world-side lens to push close real-world objects optically farther away and into sharp focus for the presbyopic user.

An augmented reality device includes an eyeglass frame and a combiner mounted on the eyeglass frame. The combiner includes an inner surface and an outer surface disposed opposite the inner surface. The device further includes an active shutter lens mounted on the combiner and an image projector mounted on the eyeglass frame and configured to project display light to the combiner such that a first portion of the display light is emitted from the inner surface of the combiner and a second portion of the display light is emitted from the outer surface of the combiner. The device additionally includes a processor coupled to the image projector and the active shutter lens. The active shutter lens is configured to shield the display light emitted from the outer surface of the combiner. The combiner is configured to emit ambient light from the inner surface thereof.

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.

A method for determining an optical system intended to equip a person on the basis of the adaptability of the person to a visual and/or proprioceptive modification of his environment, the method including a person visual behaviour parameter providing, during which a person visual behaviour parameter indicative of the visual behaviour of the person relative to a given state of the environment is provided; a reference value providing, during which a first value of the person visual behaviour parameter corresponding to a reference state of the environment is provided; a visual and/or proprioceptive modification providing, during which a visual and/or proprioceptive modification of the reference state of the environment is provided so as to define a modified state of the environment; and determining, during which an optical parameter of the optical system is determined based on the first value of the person visual behaviour parameter and on a second value of the person visual behaviour parameter associated with the modified state of the environment.

This disclosure describes, in part, eyeglass systems configured to automatically adjust an optical-power value, or optical power, of lenses of the eyeglass system based on the distance between eyes of a user wearing the eyeglass system and an object that the user is looking at. In some instances, the eyeglass system may determine a degree-of-convergence (DoC) or convergence angle between the left eye and the right eye of the user to determine the distance between the eyes of the user and the object the user is viewing. Further, the eyeglass system may include a power source and lenses that change their optical-power value based on different voltage or current values provided to the lenses by the power source.

Method of recovering vision by using a pair of glasses, comprising: dividing a diopter range into multiple diopter intervals with continuous diopter variation; selecting a first diopter interval and a second diopter interval from the multiple diopter intervals according to a user's vision recovery requirement which is lower than the user's actual diopter; selecting a left lens group corresponding to the first diopter interval and a right lens group corresponding to the second diopter interval of the glasses, which both the left lens group and the right lens group include a movable lens and a stationary lens; continuously adjusting the diopter of the glasses to be lower than the user's actual diopter, so that the adjusted diopter of each lens group satisfy the user's vision recovery requirement.

Methods and apparatus to enhance levels of oxygen in tear fluid under a worn advanced contact lens are described. The advanced contact lens may include an insert which is impermeable to fluid flow across its body. The method of enhancement may include creating pores through the insert, creating channels in portions of the contact lens body, including layers of absorptive material, including devices to generate or release oxygen or means of moving tear fluid under the contact lens.

An eye-mountable device is provided that includes an eyelid occlusion sensor. The eyelid occlusion sensor is used to detect winks, squints, downwards glances or looks, blinks, or other eye-based gestures generated by the user. Based on the detected gestures, an optical power of an adjustable lens of the device may be changed or some other operations could be performed by the eye-mountable device. Such operations could include toggling the optical power of the lens between first and second power levels due to the user squinting, looking downward, or performing some other gesture. Additionally or alternatively, such operations could include setting the optical power of the lens to a first optical power unless the user is looking downward, in which case the optical power of the lens could be set to a second optical power.

An eyelid position sensor system for an ophthalmic lens comprising an electronic system is described herein. The eyelid position sensor system is part of an electronic system incorporated into the ophthalmic lens. The electronic system includes one or more batteries or other power sources, power management circuitry, one or more sensors, clock generation circuitry, control algorithms and circuitry, and lens driver circuitry. The eyelid position sensor system is utilized to determine eyelid position and use this information to control various aspects of the ophthalmic lens.

Ophthalmic lenses incorporate multifocal properties for the purpose of slowing, retarding, controlling or preventing myopia development or progression, correcting presbyopic vision or allowing extended depth of focus. The lens has electronically controlled adjustable focus where the change in focus oscillates so rapidly that it is imperceptible to human vision.