Fast retinal nerve fibre layer (RNFL) protocol optical coherence tomography (OCT) showing average RNFL thickness with false colour coding to depict the data. Fast retinal nerve fibre layer (RNFL) protocol optical coherence tomography (OCT) showing average RNFL thickness with false colour coding to depict the data Shashi Ahuja et al. BMJ Open Ophth 2016;1:e000003 Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/