Kevin has an abiding interest in the physiology of transparent tissues of the eye: in particular the cornea, retina, and ocular lens. He was the first to isolate and functionally characterise in vitro the terminally differentiated fibre cells which form the bulk of the ocular lens. His work confirmed at the cellular level the electrophysiological and ion transporting properties of these specialised cells and their role within the connected syncytium which is the ocular lens. Kevin applies novel high resolution imaging and electrophysiological methods to the study of epithelial transport, using model systems which include the cornea, retinal pigment epithelium, lung, and gut. Among the techniques used are confocal laser scanning microscopy, immunofluorescence, optogenetics, scanning ion conductance microscopy, Raman microspectroscopy, and epithelial voltage clamp.