The invasive intracranial pressure examination includes invasive intracranial pressure examination and non-invasive intracranial pressure examination. The invasive intracranial pressure examination is performed by lumbar puncture, which is performed in the neurology outpatient clinic or ward. Patients are usually placed in lateral position with hip and knee flexed, and after the lumbar puncture, a cerebral pressure tube is connected for the examination. The non-invasive intracranial pressure test has an intracranial pressure detector, which is used to detect the intracranial pressure by placing electrodes or probes, and the non-invasive intracranial pressure test is less painful for patients. There is also an easy way to determine whether there is an increase in intracranial pressure, as increased intracranial pressure usually causes increased intraocular pressure, which can be determined by pressing the eyeballs with both fingers according to the toughness of the eyeballs.