To compare the decentration, tilt and anterior chamber depth between aspheric AcrySof® IQ IOL (SN60WF) and spheric AcrySof® Natural IOL (SN60AT).

The subjects of this study consisted of 22 patients (26 eyes) using an aspheric AcrySof® IQ IOL and 26 patients (31 eyes) using spheric AcrySof® Natural IOL. All lenses were inserted into the capsular bag after 5 mm continuous curvilinear capsulorhexis and phacoemulsification. The decentration, tilt and anterior chamber depth of both IOLs were measured on the 1^st, 30^th and 60^th postoperative day using an anterior eye segment analysis system (Scheimpflug camera, EAS-1000, Nidek, Japan).

There was no statistically significant difference in the decentration between the IQ IOL and Natural IOL on the 1^st ( p =0.05), 30^th ( p =0.09) and 60^th ( p =0.06) postoperative day. There was a statistically significant difference in tilt between IQ IOL and Natural IOL on the 1^st ( p =0.000053) and 30^th ( p =0.018) postoperative day. However, there was no statistically significant difference in tilt on the 60^th postoperative day ( p =0.05). The anterior chamber depth of IQ IOL was decreased, but was not statistically significant on the 1^st ( p =0.10), 30^th ( p =0.07) or 60^th ( p =0.06) postoperative day.

There were no significant differences between AcrySof® IQ IOL and AcrySof® Natural IOL in decentration, tilt or anterior chamber depth, showing that posterior aspheric surface causes little effect on the IOL stability.