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Mother of pearl opera glasses and leather case.

Opera glasses, also known as theater binoculars or Galilean binoculars, are compact, low-power optical magnification devices, usually used at performance events, whose name is derived from traditional use of binoculars at opera performances. Magnification power below 5× is usually desired in these circumstances in order to minimize image shake and maintain a large enough field of view.[1] A magnification of 3× is normally recommended. The design of many modern opera glasses of the ornamental variety is based on the popular lorgnettes of the 19th century.

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  1. ^ "How to Choose Opera Glasses". Archived from the original on 8 May 2016. Retrieved 24 April 2016.

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