A lightweight optical system is provided for enabling a person wearing such system to transpose viewed images. The apparatus comprises a removable, elongated, lighter than glass prism mounted in a lightweight frame which fits snugly on the face and is secured by a strap. The frame includes light occluding elements which prevent substantially all untransposed light from entering the eyes of the wearer.
Method For Achieving Improved Optical Flatness And For Making Prisms
A lightweight optical system is provided for enabling a person wearing such system to transpose viewed images. The apparatus comprises a removable, elongated, lighter than glass prism mounted in a lightweight frame which fits snugly on the face and is secured by a strap. The frame includes light occluding elements which prevent substantially all untransposed light from entering the eyes of the wearer.