Heat is what stops smart glasses holding processor performance or recording for long. Engadget on the part xMEMS thinks answers it: "The XMC-1200 measures just 46mm², which makes it possible to integrate into tight spots." It is built to sit inside a temple arm.
Gizmodo: "Despite its size, xMEMS says it can deliver 10 degrees Celsius (or about 50 degrees Fahrenheit) of cooling at a 1W thermal load." Every figure here is the company's own, and production readiness is targeted at the fourth quarter of 2027, so the earliest glasses carrying one arrive in 2028.