ICS FL-15 Frenzel Lenses are used to magnify and illuminate the eyes while minimizing visual fixation during the physical examination of eye movements. Accurate, convenient visualization of defocused eyes Frenzel Lenses magnify and illuminate the patients eyes while simultaneously defocusing vision. The lenses are powered by batteries, either disposable or rechargeable. Lightweight: The lenses are made of light plastic materials resulting in a comfortable, easy-to-use system. The lenses stay in place during Hallpike and Head-shake tests. Large viewing area: The large lenses offer an impressive viewing area to provide clear views of the eyes. The design allows the examiner to see both eyes without partitions or nose pieces in the way. Features Light weight no slippage during Hallpike or Head-shake tests. Large oversize lenses make it easier for the examiner to see both eyes simultaneously. Convenient operates on AA batteries or a rechargeable battery pack. Bright 4 bulb illumination facilitates examination.