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AIM: To observe the changes of intraocular pressure and choroidal thickness after hemodialysis in patients with chronic renal failure, and to explore the impact of hemodialysis on blood supply. METHODS: Totally 55 patients(110 eyes)with chronic renal failure who had been treated for a long time in our hospital were selected to test plasma osmotic pressure. Before and after hemodialysis 5min, hemodialysis venous blood was collected, and plasma osmotic pressure was measured. Before hemodialysis 1h and after hemodialysis 1h, intraocular pressure was measured; intraocular pressure and choroidal thickness were compared before and after hemodialysis measured by enhanced depth imaging technique of optical coherence tomography(OCT). RESULTS: After hemodialysis plasma osmotic pressure reduced, and the difference was statistically significant(t=12.73, Pt=2.07, PPCONCLUSION: After hemodialysis ocular pressure increased and the choroid thickness became thinner in chronic renal failure patients, which might affect the ocular blood flow state. It is suggested that the osmotic pressure gradient should be adjusted in hemodialysis patients and eye test and treatment must be given in necessity.

AIM:To investigate the prevalence and distribution of cataract among adults aged 50 or older in Foshan area.METHODS:Cluster sampling method was used in 4 539 inhabitants aged 50 or older in urban and rural of Foshan city from January 2014 to June 2015.All individuals were received visual acuity and eye examination, including slit lamp examination, fundus examination, automatic optometry and intraocular pressure examination. RESULTS:There were 641 patients with cataract among the 4 539 adults and the prevalence of cataract was 14.12%. The prevalence of cataract grew as the adults became older(PPP>0.05). CONCLUSION: Cataract is the most common eye disease that leads to blindness and severe visual impairment among adults aged 50 or older in the area.