Devices, methods and systems related to an adjustable polarization filter assembly are described that can be implemented as part of an eyewear or another viewing device to provide the ability to tune the polarization of light that is received based on user and environmental inputs. One example device includes a first rotatable polarization filter that is configured to change a polarization of the incident light, and a second rotatable polarization filter that is also configured to rotate and modify a polarization of light that is incident thereon. The two filters together, via rotation of the first and the second filters, can block any eigenpolarization state on a Poincaré sphere and transmit an orthogonal polarization state. The described devices provide improved viewing capability in different environmental conditions, such as under water, in haze or fog, in outdoor and indoor environments, and in day and night times.

A conventional liquid crystal lens switches on and off so slowly that a person can perceive the lens's gradual transition from high to low optical power. This makes a conventional liquid crystal lens unsuitable for focusing virtual images quickly in an augmented, mixed, or virtual reality system. Conversely, an inventive fast-switching electroactive lens system can switch so fast (e.g., in 35 milliseconds or less) that a person perceives its optical power to change instantaneously. The system accomplishes this fast switching with using an electroactive wave plate in series with slower liquid-crystal lenses. The wave place can be switched quickly between emitting vertically or horizontally polarized light. Each lens focuses either vertically or horizontally polarized light and transmits orthogonally polarized light. By switching between polarization states, the wave plate effectively turns one lens on and the other lens off much faster than either lens could be switched by itself.

An Augmented Reality (AR) device or gear or glasses or sunglasses, includes one or more imagers to capture images of an area-of-interest of an environment. A processor performs computer vision analysis or image recognition analysis, and detects one or more animals in the environment; and estimates their relative location, and further classifies them or estimates their properties. The detected and estimated information is then conveyed to the user, as an Augmented Reality layer of information that is super-imposed on the real-life field-of-view that is observed by the user. Optionally, additional indicators are used to convey the information, such as audio output, haptic output, or the like.

An Augmented Reality (AR) device or gear or glasses or sunglasses, includes one or more imagers to capture images of an area-of-interest of an environment. A processor performs computer vision analysis or image recognition analysis, and detects one or more animals in the environment; and estimates their relative location, and further classifies them or estimates their properties. The detected and estimated information is then conveyed to the user, as an Augmented Reality layer of information that is super-imposed on the real-life field-of-view that is observed by the user. Optionally, additional indicators are used to convey the information, such as audio output, haptic output, or the like.

The invention relates to an optical device (FILT) for filtering light received, by polarisation or mechanically, from a medium presenting a graphic and/or textual content, characterized in that cycles of opening and closing a vision space, in a visible light spectrum, are realized periodically using the optical device (FILT) at a preset frequency Fd and in that the successive open periods each have a duration (T1) comprised in an interval of values ranging from 15 to 35% of the duration (T) of the realized cycles.

The invention relates to an optical device (FILT) for filtering light received, by polarisation or mechanically, from a medium presenting a graphic and/or textual content, characterized in that cycles of opening and closing a vision space, in a visible light spectrum, are realized periodically using the optical device (FILT) at a preset frequency Fd and in that the successive open periods each have a duration (T1) comprised in an interval of values ranging from 15 to 35% of the duration (T) of the realized cycles.

Some embodiments provide a lens including a lens body and an optical filter configured to attenuate visible light in certain spectral bands. At least some of the spectral bands can include spectral features that tend to substantially increase the colorfulness, clarity, and/or vividness of a scene. In certain embodiments, eyewear incorporates an optical filter that enhances chroma within one or more spectral bands. In some embodiments, a wearer of the eyewear can perceive the increase in chroma when viewing at least certain types of scenes.

Some embodiments provide a lens including a lens body and an optical filter configured to attenuate visible light in certain spectral bands. At least some of the spectral bands can include spectral features that tend to substantially increase the colorfulness, clarity, and/or vividness of a scene. In certain embodiments, eyewear incorporates an optical filter that enhances chroma within one or more spectral bands. In some embodiments, a wearer of the eyewear can perceive the increase in chroma when viewing at least certain types of scenes.

The invention relates to an ophthalmic article (1) in particular for sunglasses, comprising: first layer (9) made of photochromic cellulose triacetate having a rear face (9.sub.R) to be oriented toward an eye (7) of a user and a front face (9.sub.F) to be oriented toward the field of vision (13) of the user, and a second layer (10) made of polyamide having a rear face (10.sub.R) to be oriented toward an eye (7) of a user and a front face (10.sub.F) to be oriented toward the field of vision (13) of the user, the first layer (9) being disposed proximate to the field of vision (13) of the user with regard to the second layer (10) being disposed proximate to the eye (7) of the user.

The invention relates to an ophthalmic article (1) in particular for sunglasses, comprising: first layer (9) made of photochromic cellulose triacetate having a rear face (9.sub.R) to be oriented toward an eye (7) of a user and a front face (9.sub.F) to be oriented toward the field of vision (13) of the user, and a second layer (10) made of polyamide having a rear face (10.sub.R) to be oriented toward an eye (7) of a user and a front face (10.sub.F) to be oriented toward the field of vision (13) of the user, the first layer (9) being disposed proximate to the field of vision (13) of the user with regard to the second layer (10) being disposed proximate to the eye (7) of the user.