Smart glassesWhy a wider AR view can make everyday glasses harder to build.
Inside a waveguide, brightness, fit and field of view compete for the same light. That is why one headline specification cannot explain the best design.
Inside the Tech
How the hardware works and why it matters.
5 articles
Smart glasses
Smart glassesMicroLED vs micro-OLED: why millions of nits do not settle the smart glasses race.
Tiny displays serve very different optical systems. Understanding where brightness is measured makes the spectacular numbers much less confusing.
Smart glassesThe lens that changes colour is doing two different jobs.
Photochromic and electrochromic lenses can both darken, but one responds to light and the other to a control signal. For AR, that difference changes image contrast.
Fitness wearablesYour smart ring sees a pulse, not your whole health.
A tiny optical signal becomes heart rate, variability and sleep insights through several layers of inference. Here is what those layers can and cannot tell you.
Fitness wearablesChest strap or optical sensor? The useful difference is the signal, not the slogan.
Electrical and optical trackers observe different parts of a heartbeat. Research shows why placement, movement and the reference device matter more than blanket accuracy claims.