title: Contrast visual acuity after multifocal intraocular lens implantation: aspheric versus spherical design.
abstract: OBJECTIVE
  To evaluate contrast visual acuity (CVA) after implantation of an aspheric apodized diffractive intraocular lens (IOL) or a spherical apodized diffractive IOL in cataract surgery.
  
  
  METHODS
  This prospective randomized controlled study with a 12-month follow-up compared the results of cataract surgery with implantation of an aspheric AcrySof ReSTOR SN6AD3 IOL (30 eyes) and a spherical AcrySof ReSTOR SN60D3 IOL (30 eyes). CVA with best distance correction was measured at 4 contrast levels (100%, 25%, 10% and 5%) under 3 levels of chart luminance [250, 85 and 25 candelas per square meter (cd/m(2))] using a multi-functional visual acuity tester (MFVA-100).
  
  
  RESULTS
  At 12 months after surgery, there were no statistically significant differences in 100% CVA and 25% CVA under 250cd/m(2) (P 100%=0.875 and P 25%=0.057) and 85cd/m(2) (P 100%=0.198 and P 25%=0.193) between the aspheric group and the spherical group. However, the 10% CVA and 5% CVA were significant better in aspheric group than spherical group under 250cd/m(2) (P 10%=0.042 and P 5%=0.007) and 85cd/m(2) (P 10%=0.002 and P 5%=0.039). Under the luminance level of 25cd/m(2), no significant differences was found in the 100% CVA between the 2 group (P 100%=0.245), while aspheric group had better visual acuity in the remaining 3 contracts (P 25%=0.023, P 10%=0.026 and P 5%=0.002, respectively).
  
  
  CONCLUSIONS
  [corrected] The aspheric AcrySof ReSTOR SN6AD3 IOL provided patients with better low-contrast visual acuity than the spherical AcrySof ReSTOR SN60D3 IOL.
authors.affiliation: School of Ophthalmology and Optometry, the Eye Hospital of Wenzhou Medical University, Zhejiang Eye Hospital, Wenzhou 325000, Zhejiang Province, China.
authors.forename: Jun-Hua
authors.initials: JH
authors.lastname: Li
authors.affiliation: Department of Ophthalmology, Zhongshan Hospital, Fudan University, Shanghai 200023, China.
authors.forename: Yi-Fan
authors.initials: YF
authors.lastname: Feng
authors.affiliation: School of Ophthalmology and Optometry, the Eye Hospital of Wenzhou Medical University, Zhejiang Eye Hospital, Wenzhou 325000, Zhejiang Province, China.
authors.forename: Yun-E
authors.initials: YE
authors.lastname: Zhao
authors.affiliation: School of Ophthalmology and Optometry, the Eye Hospital of Wenzhou Medical University, Zhejiang Eye Hospital, Wenzhou 325000, Zhejiang Province, China.
authors.forename: Yin-Ying
authors.initials: YY
authors.lastname: Zhao
authors.affiliation: School of Ophthalmology and Optometry, the Eye Hospital of Wenzhou Medical University, Zhejiang Eye Hospital, Wenzhou 325000, Zhejiang Province, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Lin
keywords: cataract surgery; contrast sensitivity; intraocular lens; visual acuity