In the nineteenth century this type of eyewear was referred to as eye protectors or railroad glasses. They have four colored lenses and were worn to help protect weak eyes from bright light, dust, and the wind when out riding or driving. They have steel frames with double lenses (sometimes referred to as Double-D lenses) and are tinted different shades of blue and blue-green. Lenses could be found in shades of blue, green, amber, and gray. The bows are sliding extension temples terminating in a teardrop-shaped fenestration. This pair of eyeglasses date from about 1850.
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