Korean researchers have developed a smart contact lens with sensors capable of measuring blood glucose levels.

There is one big catch: so far the lens has only been tested on rabbits, but the findings reported in the study published in the journal Science Advances could pave the way for a version for humans.

According to the study conducted by South Koreas Ulsan National Institute of Science and Technology, the lens measured glucose levels through the rabbits tears.

When glucose levels were high, a LED pixel on the lens would turn off.

"The integration of this display into the smart lens eliminates the need for additional, bulky measurement equipment," reads an excerpt from the study.

Researchers also see the smart contact lens expanding beyond just blood glucose measurement. "It offers the potential for expanded applicability in other areas, such as smart devices for drug delivery and augmented reality."

The idea behind a smart contact lens is not new. In 2014, Google revealed it was developing a lens capable of measuring blood sugar levels using a wireless chip and mini-sensor to measure glucose. The project is managed by Verily, a company under Google parent Alphabet that specializes in health care tech.