iPhone App Helps You Tell If You’re Sober Enough To Drive

A new iOS app called BreathalEyes claims that it can accurately estimate your blood alcohol content (BAC) simply by scanning the movement of your eyes. The app analyzes your horizontal gaze nystagmus (HGN), something police officers often check in conjunction with the breathalyzer test. HGN is involuntary eye movement that is sometimes caused by alcohol consumption — when your eyes can’t move smoothly and often jerk or bounce when looking from left to right.

BreathalEyes uses the built-in camera on the iPhone to record any signs of HGN and gives you a BAC result that’s within 0.02 percent accuracy. You simply hold the phone for 10 seconds while it’s framed around your left or right eye to be analyzed.

One of the limitations of BreathalEyes is that is often requires two people to use it, one of whom must be sober enough to hold the phone steadily for a more accurate reading. The app is available to download in the App Store for 99 cents.

BreathalEyes