21 DEVELOPMENTS IN OPHTHALMOLOGY DISTRIBUTION 551,841 Distribution of cataracts in the population and influencing factors : Proceedings of the 3rd International Symposium on Cataract Epidemiology, Singapore, March 15-16, 1990 / vol.eds. Kazuyuki Sasaki, 0tto Hockwin. - Basel [etc.] : Karger, [1991]. - [8], I8I s. : il., wykr. ; 24 cm (Developments in Ophthalmology ; vol,2l) ISBN 3-8055-5333-8