A Study On Vision Function Of Multifocal Intraocular Lens

Objective Comparing the vision function of the multifocal intraocular lens(MIOL) eye with monofocal intraocular lens(SIOL) eye in order to evaluate the effectiveness and safety of the MIOL.　Methods 　In this study, 44 senile cataract patients (60 eyes) were devided into two groups randomly: Group MIOL and Group SIOL. Each group included 30 eyes. All the patients accepted phacoemulsification and MIOL/SIOL implantation. The MIOL we used is AMO Array SA40N while the SIOL is Allergan SI40NB. Vision function including distance visual acuity (DVA), near visual acuity (NVA), contrast sensitivity (CS), color vision , visual field and stereopsis acuity were measured in 1d, 1w, 1m,3m postoperatively. The refraction and the pseudoaccommodation were also detected. Visual symptoms were observed by questionnaire.　Results MIOL eye showed excellent DVA as SIOL eye (1.00±0.27 versus 0.89±0.23,P>0.05) and better NVA than the later (0.86±0.27,0.45±0.14,P<0.05). The CS of both groups were within the reference range and were identical at 1.5,3 and 6 cpd spatial frequencies. At 12 and 18 cpd, the CS of the two groups lower than reference range. MIOL eye has better stereoscopic vision than the SIOL one, especially for biltateral MIOL implantaion. All the patients' color vision are good and all the patients' visual field are in normal range except for one man (1 eye) having the defect in the lower-nazal quadrant because of retinal vascular disease. MIOL provided better pseudoaccommodation than SIOL, the depth of focus were +1.0D~-3.5D, +1.0D~-1.0D respectively. Most patients were satisfied with the result of the operation but higher satisfaction was found in MIOL group when near task was asked. Conclusion MIOL is safe and effective. It can provide good DVA as the SIOL does, but better NVA and stereoscopic vision, less glasses use and higher satisfaction than the latter.