Objective derivation of the morphology and staging of visual field loss associated with long-term vigabatrin therapy

<b>Disclosures</b><br> <b>Funding </b>None <b>Conflicts of interest</b> John M Wild, Phillip EM Smith and Carlo Knupp declare that they have no conflicts of interest. <b>Ethical approval </b>All procedures performed in studies involving human participants were in accordance with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The Local Research and Ethics Committee ruled that approval was not required for this study. The visual field assessments were considered to be part of normal good clinical practice. The visual fields were de-identified and so written informed consent was not required. <b>Data availability </b>The datasets generated and/or analysed during the current study are available from the corresponding author on reasonable request. <b>Copyright</b> This video is distributed under the terms of the Creative Commons Attribution Noncommerical Licence which permits any noncommerical use, distribution, and reproduction in any medium, provided the original author(s) and the source is credited.<br>