http://slideplayer.com/3433912/12/images/21/The+viscoelastic+injection+increases+the+diameter+of+Schlemm+s+canal+from+its+usual+diameter+of+25+to+30+%C2%B5m+to+about+230+%C2%B5m+and+increases+the+patency+of+the+outflow+channels.jpg