1.Today lasers are also used to carve tissue from the cornea to correct defective vision (as shown left), and bleach birthmarks and tattoos.
如今,激光也被用来切割角膜,以矫正视力(如图所示),或者使胎记和刺青褪色。
2.Do not drive with uncorrected defective vision.
在未矫正视力前,切勿驾驶。