RT Journal Article SR Electronic T1 Convolution in human rods: an ageing process. JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 181 OP 187 DO 10.1136/bjo.63.3.181 VO 63 IS 3 A1 Marshall, J A1 Grindle, J A1 Ansell, P L A1 Borwein, B YR 1979 UL http://bjo.bmj.com/content/63/3/181.abstract AB In a morphological survey of 73 human retinae spanning 9 decades, and including 20 retinae which were obtained from eyes enucleated for malignant melanomas, nodular excrescences were noted in the outer segments of rods with an incidence which increased with age. These structures were sectioned in both their vertical and horizontal axes and on electron microscopical examination were seen to result from the localised convolution of affected outer segments. The topographic morphology of such convolutions is described and their modes of formation are discussed.