The customer should sue the company and the company's designer in the Court of First Instance in the High Court, since the quantum of damages is likely more than HK$1m due to the loss of the eye sight in the customer's right eye, assuming that she is employable, earning decent salaries and not close to her retirement age.
The customer must sue the defendants within 3 years after the incident, and should consult a law firm a.s.a.p. If she cannot afford to commence this kind of personal injuries claims against the defendants, she should go the Legal Aid Department at the Queensway Government Offices for help.