Vision Improvement

屈光度 -1.5  近視 150 度 視力 0.3-0.5
屈光度 -6  近視 600 度 視力 0.1


choose 老花眼鏡 (see far, just able to see)
10 min. only everyday, see far only, not close
+2 --- +2.5     600 degree-
+1 --- +1.5     600 degree+
+3.0 --- +3.5   prevent 老花   
cannot see clear near objects, so don't walk

http://digcan.com/eye