A protective eye mask for practicing winter sports and in particular alpine skiing is provided. The protective eye mask is provided with an electrically powered lyquid crystal (LC) lens having at least one LC layer made of guest-host (GH) type liquid crystals.

The invention relates to spectacles, systems and methods for visibility enhancement, including by glare suppression. The spectacles, systems and methods for visibility enhancement includes spectacles and a spectacle lens having a liquid crystal cell (LC), the transmission (TR) of which may be varied by a suitable control and the liquid crystal cell (LC) designed so that the transmission (TR) of the liquid crystal cell (LC) may be switched between high and low transmission states. The liquid crystal cell (LC) includes a control for regulating the times of the state of high transmission (T.sub.on) of the liquid crystal cell (LC) such that the temporal position of the times of the high transmission state (T.sub.on) within a period of times of the high transmission state (T.sub.on) and times of the low transmission state (T.sub.off) may be altered continuously or discontinuously; and/or the duration of a period of times of the high transmission state (T.sub.on) and times of the low transmission state (T.sub.off) may be altered continuously or discontinuously. Such changes may be determined by a secret coding key.

A display having a variably controlled backlight and/or driver is disclosed. The backlight includes a first light source that emits light within a first spectral power distribution and has a first radiant power output. A second light source emits light within a second spectral power distribution matched to an optical filter for producing a perceived chromaticity and luminosity matching the perceived display appearance without the optical filter.

The invention is based on a sun protection device, in particular sun spectacles, with at least one optical sun protection filter (12) comprising at least one liquid-crystal cell (14, 14′), with at least one sensor unit (16) configured for capturing a solar irradiation, and with at least one control and/or regulation unit (18), which is configured for controlling and/or regulating a permeability of the optical sun protection filter (12) depending on a solar irradiation.

It is proposed that the control and/or regulation unit (18) is in at least one operating state configured for controlling the at least one liquid-crystal cell (14, 14′) of the optical sun protection filter (12) for generating a permeability gradient (20), which is defined for a user (31) and features at least two differing permeabilities.

Devices, systems, and methods for training baseball and softball batters, to identify types of pitched balls (fast ball, curve ball, slider and changeup) and locations (strike or non-strike zone) of pitched balls in order to increase hitting accuracy A motion sensor can be triggered by the leading foot of a pitcher. The motion sensor can use cone or fan shaped sensor to detect the passage of a pitched ball from the pitcher. When the motion sensor is triggered, a signal can be sent to a black out lens that blocks the vision of a hitter being trained to identify the types and locations of the pitched balls. The training includes changing the lens from transparent to opaque at selected distances between the hitter and the pitcher. Batters can be trained to keep their eyes on the pitched balls until the ball reaches the batter. Golfers can be trained to not have to look up when their club hits the ball, where the black out lens are go opaque when the golf swing passes into the motion sensor.

Examples of security lighting routines are tailored to disrupt visual perception and/or acuity so as to significantly reduce the ability of a person or persons, who has breached security, to function within a secured space. A routine triggered in response to a security breach may include a flash at a relatively high intensity, some number of times brighter than normal illumination for the space. Some examples of routines include a warning light and/or a pre-flash light emission such as dim lighting or a flicker, to effectively prepare the person in the space for maximum effectiveness of the flash. Other examples of the routines may also include a post-flash sequence of multiple color light emissions, such as alternating emissions in sequence of pulses of different colors of light using emission and/or off time parameters that vary in an irregular manner.

The invention relates to an optical filter comprising: at least one optically transparent liquid-crystal shutter, the shutter having a polarization voltage ULCD that marks a threshold between two polarization states, and being designed to switch between at least two opacities OP1 and OP2, OP2 being strictly higher than OP1, when it receives a voltage that is above or below, respectively, the polarization voltage ULCD; and an electronic system comprising: an electronic module for controlling the liquid-crystal shutter, designed to control the voltage applied to the liquid crystal shutter; a photosensitive sensor, designed to deliver, to the electronic control module, a continuous voltage Ucs that varies depending on the luminous intensity that it receives, the photosensitive sensor being the only power supply of the electronic control module and the liquid-crystal shutter, the optical filter being characterized in that, if the photosensitive sensor receives a luminous intensity below a dazzle threshold le, the liquid-crystal shutter has an opacity OP1, and in that the electronic control module is designed, when the photosensitive sensor receives a luminous intensity above the dazzle threshold le, to deliver, to the liquid-crystal shutter, a continuous voltage Ue that is strictly above the polarization voltage ULCD of the shutter, so that the latter switches from opacity OP1 to opacity OP2.

The disclosure provides a protective visor applicable to multiple operation environments for dust prevention, anti-shock glasses, chemical defence and ray radiation protection. The protective visor comprises a headband (5), a face shield (1), protective goggles (6), a light shading screen (4), a light grid (8) and a housing (2), which are connected to each other. The light shading screen (4) and the light grid (8) constitute a light refraction and transmission device for refracting and transmitting the light, which includes a light aperture processed to have a curved surface and located at the front and upper end portion of the housing (2). The light aperture has a serrated lattice shutter structure, and the light shading screen (4) is disposed at the outer side of the light aperture. The protective visor can effectively prevent foreign splash, and absorb radiant heat and certain ultraviolet rays to protect an operator's face.

This invention relates to an optical filter for use in eyewear such as ski googles, as well as eyewear using the filter. For improving visibility in snow dominated locations, the filter has a transmission spectrum having a first transmission peak in the wavelength range of 620 nm-670, with a maximum at approximately 650 nm.

The invention relates to spectacles, systems and methods for visibility enhancement, including by glare suppression. The spectacles, systems and methods for visibility enhancement includes spectacles and a spectacle lens having a liquid crystal cell (LC), the transmission (TR) of which may be varied by a suitable control and the liquid crystal cell (LC) designed so that the transmission (TR) of the liquid crystal cell (LC) may be switched between high and low transmission states. The liquid crystal cell (LC) includes a control for regulating the times of the state of high transmission (T.sub.on) of the liquid crystal cell (LC) such that the temporal position of the times of the high transmission state (T.sub.on) within a period of times of the high transmission state (T.sub.on) and times of the low transmission state (T.sub.off) may be altered continuously or discontinuously; and/or the duration of a period of times of the high transmission state (T.sub.on) and times of the low transmission state (T.sub.off) may be altered continuously or discontinuously. Such changes may be determined by a secret coding key.