We tend to not think much on wearable technologies and in some ways this is a good thing — the primary benefit of wearing technology is, after all, so it blends more seamlessly with your day-to-day tasks. That said, it's hard to miss Google (News - Alert) (News - Alert) Glass, the product of the search giant's ongoing Project Glass that features a tiny view screen, voice recognition, and photo and video capture.

Aside from the fact that the head-mounted, augmented reality glasses are just a little flashier than your average pair of glasses, Google Glass sightings are also noteworthy simply because of the rarity of such an occurrence. However, Google co-founder Sergey Brin (News - Alert) (News - Alert) was recently spotted riding the New York City subway wearing the smart specs.

Still, though, not everyone is aware of Google Glass, so Brin's subway ride might as well have gone unnoticed if he hadn't happened to sit across from New York City resident Noah Zerkin, who describes himself as a "wearable technology enthusiast." Zerkin posted a picture of Brin on Twitter (News - Alert) (News - Alert) wearing his prototype eyewear, which caught the attention of a number of tech news sites.Meanwhile, at CES (News - Alert) (News - Alert) earlier this month, electrical lead for the Google Glass project, Russ Mirrov, was also seen wearing Google Glass.

It won't be long, though, until all types of wearable technology becomes commonplace according to Transparency Market Research. In its report entitled "Wearable Technology Market-Global Scenario, Trends, Industry Analysis, Size, Share and Forecast, -2018," the research firm stated that, while the global wearable technology market stood at $750 million last year, it's expected to hit $5.8 billion by 2018.

A Research and Markets report confirmed that the wearable technology market is on the cusp of tremendous growth as the applications in a number of segments — from wellness and fitness, to healthcare and medical, to infotainment, industrial and military — have grown with improved mobile technology.