double vision
noun [ U ] uk/ˌdʌb.əl ˈvɪʒ.ən/ us/ˌdʌb.əl ˈvɪʒ.ən/
复视
a problem with your sight in which you see two of everything, usually with one image partly covering the other
He suffered headaches and double vision after hitting his head in the accident. 自从在事故中头部受撞击后，他就出现了头痛和复视的症状。