FDA还未批准，从2006开始trial，有十来个国家加入。可能快要有结果了。很贵，LASIK的3倍。

Kamra Corneal Inlay
While the technology is not yet FDA-approved, clinical trials began in early 2006 for one device created by AcuFocus (Irvine, Calif.), which has formed a business alliance with Bausch + Lomb (Rochester, N.Y.).

http://www.allaboutvision.com/visionsurgery/corneal-inlays-onlays.htm