California-based vision systems maker WaveTec Vision is more than halfway through an $18 million equity funding round with $11 million raised so far, according to an amended report filed with the SEC this week.

The funding round began January 2, 2013, and has drawn 10 unnamed investors so far, the company reported.

WaveTec has announced some pretty significant funding rounds in recent years, including a $16.5 million raise in April 2012 and a $15.9 million raise in May 2011.

The Aliso Viejo-based company calls itself the "intraoperative wavefront measurement technology for refractive cataract surgeons, providing on-demand information that increases the precision of cataract surgery so patients achieve their best possible vision."

WaveTec is developing its ORA System, a diagnostic device that provide continuous measurements of a patient’s eye during cataract surgery, allowing for more precise measurements to help improve refractive outcomes.