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. 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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- Chambers's Encyclopaedia: A Dictionary of Universal Knowledge, Volume 7
- The Opticalia Museum Opera Glasses
- The Encyclopedia Americana, Volume 11
- The History of Opera Glasses
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