Apparatus is provided for expanding a Schlemms canal of an eye of a subject, the apparatus including an introducer having a lumen and a plurality of expandable porous structures sized and shaped to be disposed with the lumen. The expandable porous structures are configured (a) to be inserted into the Schlemms canal at discrete locations around the canal, (b) to be inserted into the Schlemms canal while in a collapsed form, and (c) to expand while inside the Schlemms canal.
