A Comparative Study Of The PCO (Posterior Capsule Opacification) Incidences For Ultraviolet-cut And Cyanopsia (UVCY) IOLs And Ultraviolet-light-filtering (UV) IOLs

Objective: To compare the PCO(posterior capsule opacification) incidences for ultraviolet-cut and cyanopsia (UVCY) IOLs and ultraviolet-light-filtering (UV) lOLsMethods: 162 eyes from 138 cataratous patients operated in He Eye Hospital during 2001 were used for this study. These patients had no any other local and systemic disease which affects on eyes. Standardized phacoemulsification surgeries were performed by the same skilled phaco-surgeon. Postoperative medications were the same. 79 eyes of these patients icceived UVCY-IOLs, and the others 83 eyes received UV-IOLs. Both UVCY-IOLs and UV-IOLs are made of PMMA. The only difference of these two types of IOLs is that UVCY-IOLs contains a kind of yellow pigment for preventing phototoxicity. These patients were followed up for average 24m 1w. 162 eyes (138 patients) were assessed and semi-quantitatively by bio-microscopy to investigate the incidences of posterior capsule opacification(PCO) and the incidences of Nd: YAG laser posterior capsulotomy.Results.- During the follow-up, the incidences of PCO in UVCY is 8.2% (6/79 eyes), while the incidences in UV is 18% (15/83 eyes). The mean PCO value in the UVCY-IOLs group decreased significantly (x 2=3.938>3.84, P<0.05).conclusion: The incidences of PCO is lower in the UVCY-IOLs group than that in the UV-IOLs group.