A system for positioning an eye for laser surgery includes a first and a second line generator positioned, respectively, to emit a first line and a second line orthogonal to the first line, the line generators positioned in a predetermined relation to a laser surgical system. The light directing device includes one or more glass layers, and a light collecting panel attached to the glass layer with a bonding layer and made of polymer materials which are mixed with the nanometer particles to form the light collecting panel. A first cavity extending from a first opening at a surface of the foam structure and into the foam structure. In response to providing the payment information, the second user could select the share link enabling the second user to download the content item. ; and lowering the temperature of the membrane to below 200\xb0 C. In particular, sprayable alkaline aqueous chlorine compositions including a surfactant system for modifying the viscosity of the composition, are combined with an alkalinity source and a chlorine source.