?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Wilkins%2C+Mark&rft.aufirst=Mark&rft.aulast=Wilkins&rft.inst=UCL+(University+College+London)&rft.tpages=198&rft.degree=Doctoral&rft.date=2002&rft.title=Visual+field+changes+following+trabeculectomy