Öffne meine Augen appears to be a German version of Open thou mine eyes composed by John Rutter. The version sung by the Weimar Kreuz Chor, Korea in the listed video is exactly the same as the loose sheets in my possession. I learned and sang this lovely piece as a bass singer in Die Zeitlupe sometime in 2006. Where their leader, Jürgen Blendermann, got it - I do not know. Does anyone out there in cyberspace know?
It is listed in Geoff's Choral Odds and Ends..