As for vision requirements, look at this. It is explained in the application guide.
47. What are the requirements for eyesight of the people's police who apply for judicial police positions in public security organs, prison drug rehabilitation management organs, and law enforcement and procuratorial organs?
According to the "Special Standards for Physical Examination of Civil Servants (Trial)", those who apply for the positions of judicial police in public security organs, prison drug rehabilitation management organs and legal inspection courts are unqualified if their unilateral naked eye vision is less than 4.8.
Those who apply for medical positions with unilateral corrected vision less than 5.0 in forensic medicine, physical evidence inspection and appraisal, information and communication, network security management, financial accounting, foreign language and minority language translation, traffic safety technology, safety prevention technology, explosive disposal, police dog technology, network security and law enforcement, trace inspection, criminal technology, medical positions in supervision places, prison doctors and psychological correction positions in judicial administrative departments are unqualified.