title: Comparison of higher-order aberrations and contrast sensitivity between Tecnis Z9001 and CeeOn 911A intraocular lenses: a prospective randomized study.
abstract: BACKGROUND
  The advent of wavefront technology in the past five years has provided some insight into the optical outcomes of cataract surgery. The Tecnis Z9001 intraocular lens (Tecnis IOL, AMO) with a modified prolate anterior surface was claimed to reduce or even eliminate ocular spherical aberration to improve the visual quality. The purpose of this study was to determine whether Tecnis IOLs can improve the quality of vision as evaluated by measuring visual acuity, wavefront aberration, and contrast sensitivity.
  
  
  METHODS
  In an intraindividual prospective study, 20 patients with bilateral cataract were randomly assigned to receive a modified prolate anterior surface IOL (Tecnis Z9001, AMO) in one eye and a biconvex spherical surface IOL (CeeOn 911A, AMO) in the other. After 3 months, the following were investigated: best corrected visual acuity, pupil diameter, photopic and mesopic contrast sensitivity, and wavefront aberration of the whole eye (ocular), cornea, and internal plane.
  
  
  RESULTS
  The differences in the best corrected visual acuity and pupil diameter between the two groups were not statistically significant. Negative 4th-order spherical aberration (Z(4)(0)) was found in the Tecnis group, whereas positive Z(4)(0) found in the CeeOn group for the internal and ocular plane. Statistically significant differences were found at the ocular higher-aberrations between the two IOLs. Contrast sensitivity testing showed significantly better results in the Tecnis group at visual angles higher than 1.0 degree under photopic conditions and at visual angles higher than 1.6 degree under mesopic conditions both without glare and with glare in comparison with the CeeOn group.
  
  
  CONCLUSIONS
  The Tecnis Z9001 IOL with a modified prolate anterior surface produces negative spherical aberration and consequently reduces the higher-order aberrations in pseudophakic eyes. This leads to enhanced contrast sensitivity and improved functional vision compared to conventional spherical IOLs.
authors.affiliation: Zhongshan Ophthalmic Center of Sun Yat-sen University, Guangzhou 510060, China. chenwrq@yahoo.com.cn
authors.forename: Wei-rong
authors.initials: WR
authors.lastname: Chen
authors.forename: He-hua
authors.initials: HH
authors.lastname: Ye
authors.forename: Yi-yong
authors.initials: YY
authors.lastname: Qian
authors.forename: Wen-hui
authors.initials: WH
authors.lastname: Yang
authors.forename: Zhi-hong
authors.initials: ZH
authors.lastname: Lin
mesh_terms: D002386:Cataract / Q000503:physiopathology / Q000628:therapy; D015350:Contrast Sensitivity; D006801:Humans; D007910:Lenses, Intraocular; D011446:Prospective Studies