[名词解释] 散光

近视 获得性梅毒治疗的首选药物是() ["A．强力霉素","B．大观霉素","C．青霉素","D．四环素"] 青霉素血清浓度达多少即有杀灭梅毒螺旋体的作用() ["A．O.O1IU/ml","B．O.03IU/ml","C．O.06IU/ml","D．0.1IU/ml"] 老视 隐性远视 散光