How to open this thing?

Hello,

This is a device from Ampere's IndieGoGo campaign. It is a great device, but one or more glasses lose tinting capabilities in about a year. Ampere was kind enough to replace the first one, but after a year, the replacement is now dead, too.

I've contacted Ampere about a manual to fix it or any guidance how to open the device without breaking stuff, but they refused citing "propriety reasons." Now, I'm stuck with not one but two not-so-smart sun glasses that does not block the sun.

I'm inclined to perform a surgery on one of them but I'd like to learn more about how to open one without breaking. Do you guys have any ideas, or guides?

Best regards