 B3 is a medical based Paralympic classification for blind sport . Competitors in this classification have partial sight , with visual acuity from 2 / 60 to 6 / 60 . It is used by a number of blind sports including para @-@ alpine skiing , para @-@ Nordic skiing , blind cricket , blind golf , five @-@ a @-@ side football , goalball and judo . Some other sports , including adaptive rowing , athletics and swimming , have equivalents to this class . 
