Dear sir , during vision test ,machine diagnosis of my vision was -1 spherical for right eye and -0.50 spherical with -0.50 cylindrical for left eye . However during the physical check by the doctor, for my left eye vision is 6/6 by using -0.75 spherical as well as by using -0.50 spherical with -0.50 cylindrical . Right eye is same as machine -1 spherical . So for my left eye what power should I be using -0.75 spherical or -0.5 spherical with -0.5 cylindrical. Regards