In vitro percentage cell viability following application of formulation excipients and the final MHME (1:10 dilution) to human corneal epithelial cells for 15 min. In vitro percentage cell viability following application of formulation excipients and the final MHME (1:10 dilution) to human corneal epithelial cells for 15 min. Each bar represents the mean percentage cell viability. Error bars represent the SD. CCTG, caprylic/capric triglyceride MI12; MHME, Manuka honey microemulsion; PS 80, polysorbate 80; SD, standard deviation. Jennifer P Craig et al. BMJ Open Ophth 2017;1:e000065 © Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2016. All rights reserved. No commercial use is permitted unless otherwise expressly granted.