A simple and inexpensive techniques of documenting and video-recording ocular motility and nystagmus

Frenzel goggles are a diagnostic tool used for the evaluation of nystagmus. These goggles include a high-powered (+20 diopters) lens in front of each eye and side-illumination system. The high-power lenses serve 2 functions; interfering with fixation (which may suppress nystagmus) via fogging the eyes, and providing the examiner with adequate magnification of the eye to better visualize nystagmus. It is a common practice to utilize Frenzel goggles along with a video camera to document nystagmus for diagnosis, documentation and monitoring of nystagmus especially after interventions such as medications and/or extraocular muscle surgery. Although Frenzel goggles are helpful while examining nystagmus, they have the limitations of bulkiness, high-cost and limited availability.