1375results about How to "Protect eyesight" patented technology

A device (100, 140, 150) for differentially absorbing light, depending on the state of linear polarization of the light, is disclosed. This polarizing effect is induced and controllable by the level of ambient light impinging on the device. The device (100, 140) may be used as an anti-glare vision protection device which selectively absorbs specularly reflected sunlight in brightly lit environments while permitting all light to pass in dimly lit environments. The device (100) includes a carrying medium which may be a film (142) or opposed substrates (112) that are sealed. A film or the opposed substrates carry a mixture (120) of fluid material (124) and photochromic dyestuffs (122), wherein the photochromic material is activated upon the detection of ultraviolet light so as to absorb some of the light and wherein the energization of the photochromic material effects the material so as to simultaneously selectively absorb the specularly reflected sunlight. The material (124) may be any fluid that dissolves the photochromic dyestuff material (122). The fluid is preferably a liquid crystal material such as nematic or chiral nematic. Alternatively, the material (124) may be a polymer liquid crystal. The device (150) may allow for electrical control of the absorptive properties.

The invention discloses a full-automatic myopia prevention and humpback prevention intelligent table and chair. The full-automatic myopia prevention and humpback prevention intelligent table and chair comprises a chair base and a lower desktop support. The full-automatic myopia prevention and humpback prevention intelligent table and chair is characterized in that backrest supports are fixedly arranged on the two sides of the chair base, a plurality of chair surface adjustment holes and a plurality of backrest surface adjustment holes are formed in the backrest supports, a chair surface is matched with the middle portions of the backrest supports on the two sides of the chair base in a sliding mode, the chair surface is vertically positioned in the chair surface adjustment holes of the backrest supports through bolts, a backrest surface is matched with the upper portions of the backrest supports in a sliding mode, the backrest surface is vertically positioned in the backrest surface adjustment holes of the backrest supports through bolts, and a pillow backrest is arranged at the upper end of the backrest surface. The full-automatic myopia prevention and humpback prevention intelligent table and chair can effectively prevent and correct some bad habits of children in the learning process, and can effectively prevent myopia and humpback.