Myopia prevention pen

Myopia prevention pen belongs to student's apparatus technical field, and aim at solves that prior art exists can't effectively protect the problem of eyes. The utility model discloses a pen tongue one end and nib are connected, and the other end and ink sac are connected, and the tubulose is held a cladding and in pen tongue's the outside, is held position and pen -holder threaded connection and form the pen body, the pen body sets up in the outer shaft of a writing brush, and the outer shaft of a writing brush includes threaded connection's anterior segment and back end, and the back end inner wall length direction of the outer shaft of a writing brush is provided with the spout, and pen -holder outer wall length direction is provided with the slider, slider and spout sliding fit, and the nib passes the tip of outer shaft of a writing brush anterior segment, holds the tip opening transition fit of position and outer shaft of a writing brush anterior segment, and the cap for brush and outer shaft of a writin