Shares of Optos plc (LSE:OPTS) gained 6.4 percent after the company announced that the FDA granted 510(k) clearance in the U.S. for its Project Daytona retinal scanning device. The British ophthalmology device maker’s stock closed at £1.62 today (about $2.64), up about 15 cents since August 25, the day before the clearance announcement, when OPTS shares closed at £1.52 ($2.49) on the London Stock Exchange. “Optos is now in preparation for full product launch on schedule in the first calendar quarter of 2012,” according to a press release.