Blocking a blind person’s ears to help them navigate is a bad trade.

Hearing does much of the work that sight cannot. Traffic, footsteps, the echo of a corridor, an announcement on a platform — losing any of it to a pair of earbuds costs more than the guidance gains. Phoenix Eye carries sound through the bone in front of the ear instead, leaving the ear canal completely open. In testing this turned out to be non-negotiable: testers who tried conventional earpieces during early trials removed them within minutes on busy streets. The trade-off is a quieter, thinner sound, so descriptions are written to be short and clearly structured rather than loud.