New Year is one of the biggest party events in the world. For those of legal age, consuming alcoholic beverages is a key component of that, and most other, celebration. To assist in safety, many developers have created blood alcohol content (BAC) estimation apps. However, these apps require a user, one who is intoxicated of all things, to log each drink. Suffice it to say, that rarely happens. Thankfully, the team at Xplor Apps has come up with a better solution, BreathalEyes, an app which uses physical symptoms to calculate your BAC.

BreathalEyes - Scan

All it takes is 15 seconds, an iPhone, and an eye to estimate a person's BAC

It’s common knowledge alcohol consumption causes several physical effects, such as loss of balance and reduced reflexes. Some of the symptoms are less obvious but can be even more accurate in judging how intoxicated an individual is. For example, Nystagmus, a condition where a subject exhibits very small involuntary movements of the eyes. This is what BreathalEyes analyzes; and more specifically, Horizontal Gaze Nystagmus (HGN).

How do you use BreathalEyes? Foremost, you’ll need to find a friend to be your “tester.” Utilizing the iPhone’s rear camera, the tester will choose one of your eyes to test and center that eye in the BreathalEyes‘s green tinted scanning rectangle. Before the tester can initiate the scan, you must look outwards, meaning, the eye you’re not testing should be looking at your nose. The tester taps the rectangle to begin the scan, which is a series of close proximity eye position captures.

• Technology based on 40 years of public and private testing.
• Effective range: 0.02% – 0.17% (+/- .02%) BAC.
• No network connection requirements.
• No advertisements.
• No data logging: no privacy concerns.
• Flash function for low lighting conditions.

While BreathalEyes is quite accurate, it is not a legal BAC measuring tool. Certain medical conditions of the eye, medications, and other variables will reduce accuracy. Always drink responsibly, including having a designated sober driver if you plan on traveling. AppAdvice and Xplore Apps are in no way liable for any actions, damages, and so on resulting from the use of this or any other app, alcohol consumption, etc.

BreathalEyes is compatible with iPhone 4 and iPhone 4S running iOS 4.1 or later, and available in the App Store for $0.99.