The width of the pars plana and the distances between the corneo-limbal junction and the posterior aspect of the pars plicata as well as of the ora serrata were determined by measurement in 17 autopsy eyes and additional 12 dissected autopsy eyes of premature and mature babies and infants. The data were correlated to age and length of the globe. The site of sclerotomy in transscleral lensectomy of congenital cataracts is discussed.