Abstract: A hand-held timing device includes a housing including at least one substantially transparent aperture, a haptic motor disposed within the housing and configured to generate tactile feedback in response to being triggered by any of a plurality of timers, at least one light source disposed within the housing and configured to be visible through the at least one transparent aperture, and a first plurality of buttons selectable to activate the plurality of timers. The plurality of timers includes a first plurality of timers configured to control generation of a series of tactile feedback indications delineating timing of one or more sub-portions of a Horizontal Gaze Nystagmus (HGN) test, and at least one fixed duration timer associated with a particular one of the plurality of buttons, the at least one fixed duration timer configured to measure a fixed duration and control generation of a tactile feedback indication upon expiration of the fixed duration.

Abstract: A handheld testing device includes a focus light source, which can serve as a focal point for a subject being tested for nystagmus, and multiple timers, which can be used to control tactile and other feedback indications. The timers can include an Equal Tracking (ET) timer and Smooth Pursuit (SP) timer, each of which controls a series of tactile feedback indications that can assist a user in properly performing ET and SP portions of a Horizontal Gaze Nystagmus test. Other test timers configured to generate feedback indications for use in various medical examinations and drug evaluations are also included. The handheld device can include multiple light sources in addition to the focus light source, for example an ultra-violet (UV) source or a white light source. Various fixed interval timers can also be included in the handheld testing device.