I originally shared Ocular Trauma with readers via LiveJournal. On some days I'd attach a bonus comic. My recollection is that to get the bonus comic, the reader had to click a link to vote for Ocular Trauma on
Top Web Comics. TWC had set things up so that clicking the link would automatically dispense the preselected bonus comic. The bonus comics are a mixture of making-ofs, isolated props and characters from the main strip, and eight guest comics by four guest authors. The 'sausage' issues (10-14) are by the guy who drew Chair. All twenty-four bonus comics that I've found (which might be all that appeared, but might not) are in the gallery below.