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These types of glasses seem like they've been around for a while. Here's an article where they were introduced 6 years ago, they've been available in US movie theatres for a while. Also, not sure if this article is behind the times, but here's another article from a year ago where they talk about The National Theatre unveiling these glasses.

https://www.digitaltrends.com/cool-tech/sony-subtitle-glasse...

https://www.121captions.com/2017/10/20/closed-captions-movie...

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These glasses react to live speech and stage cues. The ones developed for movie theaters can be much simpler technology since the pacing of a movie never changes. You just have to sync to the subtitles once and then they are synced for the entirety of the movie. Theater performances can vary from show to show and therefore these glasses have to be able to continuously react and adjust in order to keep in sync.

The software that this article talks about is the big deal in this context. Having set up and run open caption systems for live theatre before I can say it can be really hard to do manually, so having software be able to do this effectively really is a feat.

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