Made from plastic and used to aid vision, the Optivisor is a binocular polished glass lens attached to a fully adjustable leather-lined headband.

When not in use the lens can be swivelled up.

Various strengths are available and spare lenses can be interchanged. For spare lenses see 999 237/307 & 377-380.

To replace the lens: Unscrew the nut on the rear of the lens, and the bolt on the front, then push forward. The lens is released.

To replace another lens simply push the lugs through the holes on the optivisor until they 'click' into position. Please note the magnification is 3.50X and the focal length is 100mm (4").