Both Slate and USA Today recently posted stories on what happens to those 3D glasses after a Digital 3D movie.

It turns out that IMAX, Dolby and XpanD glasses are washed on site, while market leader RealD has them sent to special recycling center.

A few interesting facts:

• 700,000 RealD glasses are used every day. Wow!
• XpanD's glasses run about $50 each(!)
• IMAX says its glasses can be washed 500 times.
• 75% of Avatar viewers chose the 3D version.
• At the Cinerama Dome in Hollywood, customers are given dirty glasses and handed disinfecting wipes. (Boo!)

Read the full articles at Slate and USA Today.

Thanks to Brian Wallace for the news tip.