Show HN: Glasses to detect smart-glasses that have cameras
A prototype pair of “ban-ray” glasses aims to spot nearby smart-glasses with cameras, using techniques like detecting retro‑reflections from lenses and scanning Bluetooth traffic. Commenters explore whether such personal counter‑surveillance can meaningfully protect privacy in a world already saturated with smartphones, CCTV, and doorbell cameras, raising legal questions about recording in public, the illegality of wireless jamming, and the limits of technical fixes versus regulation. Others note both legitimate uses for camera glasses (accessibility, documentation, work tasks) and the risk that social norms could normalize pervasive, hard‑to‑detect recording.
Project concept & perceived use cases
- Device aims to detect nearby camera-equipped smart glasses, primarily Meta/Ray-Ban, via IR reflection and wireless (BLE/Wi-Fi) signals.
- Some see strong use cases for mobile protection in public spaces (e.g. bars, red light districts, events, courthouses) or for staff/security where filming is banned.
- Others would use it for scanning Airbnbs or hidden cameras generally, not just smart glasses.
- A few commenters simply want personal protection from “glassholes,” even at the cost of wearing conspicuous hardware.
Privacy, norms, and legal context
- Many comments express dystopian concern about ubiquitous corporate recording for ads, politics, or tracking.
- Debate over whether the solution is primarily legislation, social norms, or individual tools; several say individuals can’t win this alone, others argue norms still matter.
- Legal discussion contrasts:
- US: strong protections for recording in public via First Amendment–related jurisprudence, plus one-party-consent states for audio.
- EU/UK: expectations of privacy in public, strict rules around creating “databases,” GDPR, and limits on constant surveillance vs incidental photos.
- Some argue that pervasive cameras already exist (phones, Ring, CCTV), so singling out smart glasses is inconsistent.
Technical approaches & countermeasures
- IR retroreflection / optics-detection is known from counter-sniper and anti-piracy systems; might work better in low light.
- BLE/Wi-Fi traffic analysis could distinguish glasses presence and possibly recording, but bandwidth patterns overlap with other devices.
- Ideas floated: IR LED “flooding” to wash out sensors, reflective clothing, license-plate reader jamming, EMP-style disruption, and even auto-lawsuit triggers via MAC address.
- RF jamming is repeatedly noted as illegal and potentially dangerous (interference with emergency services).
Limitations, false positives, and arms race
- Hidden micro-cameras in pens, key fobs, or clothing are cited as a bigger threat than visible smart glasses; detection will never be complete.
- QA-minded commenters ask how easily the system could be spoofed with similar BLE packets or optics, and how to manage false positives.
- Some foresee an escalating arms race: detectors, counter-detectors, normalization of covert recording, and possible future where detection becomes much harder.
Smart glasses: harms, benefits, and accessibility
- Strong unease about normalization of constant recording; references to “Black Mirror” and social decay from omnipresent cameras.
- Others highlight legitimate uses: tradespeople documenting work, cooking content, bodycam-like evidence against gaslighting, and especially accessibility (vision assistance for blind/low-vision users, potential for face or scene description).
- Concern raised that broad anti-smart-glasses tools might inadvertently disable assistive devices for blind users.