methods , systems and devices for determining whether a patient has an abnormally high level of intracranial pressure is described . the method includes using a pupillometer to obtain pupillary response data from the patient . the pupillary response data can be representative of one or more pupillary response characteristics of the patient . the method further includes providing a data analysis system comprising a microprocessor that is in communication with the pupillometer . the microprocessor includes an algorithm that converts the pupillary response data to a scalar value that is indicative of the patient &# 39 ; s level of intracranial pressure . the microprocessor can be a stand - alone computer connected to the pupillometer or it can be integral with the pupillometer . the method further includes using the data analysis system to derive a scalar value based on the pupillary response data from the patient , wherein the scalar value is indicative of the patient &# 39 ; s level of intracranial pressure . the scalar value can be represented by a numerical value , graphical depiction , color , sound , or other visual or audio means that indicates a value . the scalar value can be a scalar value that indicates that the patient &# 39 ; s pupillary response characteristics indicate that the patient &# 39 ; s intracranial pressure is within a normal range , an abnormal range , or that the pupillary response characteristics indicate that the pupil is non - responsive .