Those glasses are a neat leap, but the biometric link is a double‑edged sword—if the sensor fails or is spoofed, you’re staring at a blind spot. I’d layer in a hardware‑backed HSM that lives inside the frame, so every encryption key is generated on‑device and never leaves the silicon. Then, for a fail‑safe, add a secondary passive key—maybe a tiny U2F‑style token embedded in the frame—that kicks in if the biometric chain breaks. Don’t forget a secure boot chain that checks every firmware module, and an audit log that’s write‑only and tamper‑evident. That way, if the glass goes rogue or the wearer’s eye sensor fails, you still have a solid, verifiable encryption path.