The three people are wearing black blindfolds.
People are taking a vision test at an eye doctor.
One can not be wearing blindfolds and taking a vision test simultaneously.
exists e1 s1 x1 x2.(n_people(x1) & card_eq_3(x1) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_blindfold(x2) & a_black(s1) & Theme(s1,x2))
exists e1 x1 x2 x3 x4 x5.(Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & at(x2,x4) & n_doctor(x4) & of(x4,x5) & n_eye(x5) & n_test(x2) & of(x2,x3) & n_vision(x3) & n_people(x1))