Abstract: A portable device in the form of a mask (10) that can be worn over a user's eyes (22) is provided with a non-visible light source to illuminate the user's eyes (22), and a lens arrangement (30) and image capturing means to capture digital images eyes (22) that can then be processed and used to diagnose a variety of dizziness and balance-related disorders and disease. The mask (10) includes a light-omitting seal or cover (16) to prevent external light reaching the eyes (22). The images can then be sent via data transmitter to an external device for processing and/or further analysis. The mask (10) has particular suitability for use remotely by patients themselves during a dizziness episode.

Abstract: A mask (10) has a lightweight, robust, plastics or metal frame or body (12) on which other components are supported. The body (12) includes straps or arms (14) to allow the mask to be temporarily attached to the user's head and is designed to provide a light omitting cover for the user's eyes. A suitable light source such as an infrared light source (20) is provided to illuminate the user's eyes (22). A pair of lenses (30) is provided to focus images of the user's eyes onto a pair of image sensors (40). There is also described a method of diagnosing various disorders by investigating changes in the eye using the mask (10). The portable device (10) can be used for the investigation of nystagmus or more generally in oculography, and for the investigation of other changes in the eye.