Abstract: Two types of blue light blocking contact lenses are provided and are formed by curing different compositions. The first composition includes a blue light blocking component formed by mixing or reacting a first hydrophilic monomer and a yellow dye, a first colored dye component formed by mixing or reacting a second hydrophilic monomer and a first colored dye, at least one third hydrophilic monomer, a crosslinker, and an initiator. The first colored dye includes a green dye, a cyan dye, a blue dye, an orange dye, a red dye, a black dye, or combinations thereof. The second composition includes a blue light blocking component, at least one hydrophilic monomer, a crosslinker, and an initiator. The blue light blocking component is formed by mixing or reacting glycerol monomethacrylate and a yellow dye. Further, methods for preparing the above contact lenses are provided.

Abstract: A baseball pitch-training apparatus includes a first-sampling region, second-sampling region, and a microprocessor. The first sampling region further includes a plurality of vertical and horizontal sampling units respectively along the vertical direction and the horizontal direction at the front edge of the home plate. The second sampling region is located in the rear of the first sampling region and also includes a plurality of vertical and horizontal sampling units. The sampling units of the present invention are used to generate position signals of a passing ball that will be forwarded to the microprocessor for further parsing the speed and the trajectory variation of a pitched ball, and determining whether or not the ball passed a strike region.