title: Characteristics of spherical aberrations in 3 aspheric intraocular lens models measured in a model eye.
abstract: OBJECTIVE
  To evaluate the spherical aberration in aspheric intraocular lenses (IOLs) using a model eye.
  
  
  METHODS
  Nara Medical University, Nara, Japan.
  
  
  METHODS
  Experimental study.
  
  
  METHODS
  This study tested 20.00 diopter (D) and 10.00 to 30.00 D aspheric IOLs in a fluid-filled model constructed to replicate the optical condition of a pseudophakic human eye. Spherical aberration was measured by Hartmann-Shack aberrometry. The 3 IOLs tested were the Acryfold AC60AD (IOL AC), Acrysof IQ SN60WF (IOL IQ), and Tecnis ZA9003 (IOL ZA). The 1-sample t test and Pearson correlation analysis were used for statistical evaluation.
  
  
  RESULTS
  The measured spherical aberration in the 20.00 D IOL AC was statistically significantly less than the manufacturer-indicated value (P=.0020); there was no significant difference for the 20.00 D IOL IQ and IOL ZA. The correlation between IOL power and spherical aberration was significant for IOL AC with a 4.0 mm aperture (P=.0007, r = -0.646) and 6.0 mm aperture (P<.0001, r=-0.684), IOL IQ with a 4.0 mm aperture (P=.040, r=-0.390) but not with a 6.0 mm aperture (P=.929), and IOL ZA with a 4.0 mm aperture (P<.0001, r=-0.696) and 6.0 mm aperture (P=.011, r=-0.470).
  
  
  CONCLUSIONS
  Negative correlations were found between IOL power and spherical aberration for 3 aspheric IOL models, particularly for IOL AC and IOL ZA. In a clinical setting, aspheric IOL implantation may result in negative spherical aberration that could exceed the manufacturer-indicated value.
authors.affiliation: Department of Ophthalmology, Nara Medical University, Kashihara, Nara, Japan. ftaketan@naramed-u.ac.jp
authors.forename: Futoshi
authors.initials: F
authors.lastname: Taketani
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Hara
mesh_terms: D057128:Aberrometry; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008954:Models, Biological; D012030:Refractive Errors / Q000175:diagnosis* / Q000209:etiology