A method and apparatus for monitoring optic function is provided. The apparatus and method relies on two principle modes of measuring the function of the optic nerve, namely, monitoring VEPs for neural function, and monitoring at least one additional parameter of optic function such as intraocular pressure, blood flow or location of the eye to provide a multi-variable optic function monitor. The method and apparatus is proposed for the use to diagnose and potentially prevent the incidence of POVL and anaesthesia awareness in patients during medical procedures.