Opera glasses were a unique kind of glasses similar to binoculars, used to view an opera from theatre seats which were far away from the stage.
Grace Holloway making good use of her opera glasses. (TV: Doctor Who [+]Matthew Jacobs, Doctor Who Television Movie (Fox Broadcasting Company, 1996).)
Grace Holloway used a pair of opera glasses during a performance on the night of December 30, 1999, until she was called to perform surgery at Walker General Hospital. (TV: Doctor Who [+]Matthew Jacobs, Doctor Who Television Movie (Fox Broadcasting Company, 1996).)
The Eighth Doctor used a pair of opera glasses on Earth in the Third Glorious Empire. He remarked to Tania Bell that he had last worn the jacket he took them from at La Scala in 1831 or 1832. (AUDIO: Dead Time [+]Matt Fitton, Stranded 2 (The Eighth Doctor Adventures: Stranded, Big Finish Productions, 2021).)
The Ninth Doctor had acquired a set of opera lens. He used them as a magnification device to survey a bombing site near Limehouse Green where a Chula ambulance had crashed. This pair of glasses seemed to be designed of either alien or futuristic technology; with glowing symbols visible when looking through. (TV: The Empty Child [+]Steven Moffat, Doctor Who series 1 (BBC One, 2005).)
