A device including a nose pad configured to be placed on a nose of a user; and a first visual shield coupled to the nose pad and including a first plurality of hydraulic tubes radially spaced apart from each other and a light-blocking material therebetween, wherein the hydraulic tubes are configured to radially extend in response to hydraulic pressure to selectively restrict the user's peripheral visual field and consequently by elimination of the peripheral vision that distract the user result in increasing the user's concentration; and a hydraulic pump connected to the plurality of hydraulic tubes, the hydraulic pump being coupled to the nose pad and configured to provide hydraulic pressure for radially extending the first plurality of hydraulic tubes.