Abstract: A method of coloring a glass optical structure comprising providing a first glass plate member having a smooth exterior surface and an interior surface, applying a transparent paint layer to said interior surface, providing a clear layer of flowable plastic over said paint layer so that said flowable plastic fills any variations in said paint layer, and prevents optical distortion in said structure, and applying a second glass member having a smooth exterior surface and an interior surface adjacent said flowable layer. In structural form, the optical system comprises a four-layered optical structure. The flowable plastic corrects any optical distortions created by variations in the paint layer.

Abstract: The method of making an optical layered structure having irregularities on a surface contained therein, so that an image of said surface irregularities is reflected, while permitting coherent light transmission through said structure, comprising: a first clear hardenable plastic layer having irregularities on a first surface thereof; applying a first transparent medium to a surface of said first plastic layer opposite said first surface; applying a second clear hardenable plastic layer to fill in the irregularities on said first surface of said first plastic layer; applying one surface of a second transparent medium directly to the second plastic layer in adhering relationship thereto, where one of the opposing surfaces of the second transparent medium is smooth and becomes the outside surface of said optical layered structure formed by the first transparent medium, the first and second plastic layer, and the second transparent medium. The invention also relates to the structure formed by such method.

Abstract: A method of restoring the coherent light transmitting property of a first plate-like transparent medium which has a specific index of refraction and whose surface irregularities produce light scattering image distortion, which comprises the steps of applying a clear hardenable plastic to the said irregular surface, where such plastic has an index of refraction substantially similar to the index of refraction of the transparent medium and then applying one surface of a second separate part of the transparent medium directly to the plastic in adhering relationship thereto, where one of the opposing surfaces of the transparent medium is smooth and becomes the outside surface of a laminate formed by the first transparent medium, the plastic and the second part of the transparent medium.