1. A portable video oculography system comprising: a head mounted base adapted to be attached to a patient's head; at least one digital camera attached to the base, each camera configured to take images of one of the patient's eyes; and a controller coupled to each digital camera and receiving and storing data signals there from, the controller configured to crop the images to a defined region of interest of each image, whereby the controller is configured to ignore the data outside of the region of interest of the digital image following the cropping.