title: Comparisons of amplitude of pseudoaccommodation with aspheric yellow, spheric yellow, and spheric clear monofocal intraocular lenses.
abstract: OBJECTIVE
  To determine the amplitude of pseudoaccommodation and higher-order aberrations with three types of implanted monofocal intraocular lenses (IOLs): aspheric yellow (IQ); spheric yellow (NT); and spheric clear (AT).
  
  
  METHODS
  Department of Ophthalmology, Nara Medical University, Nara, Japan.
  
  
  METHODS
  We studied 60 patients who underwent small incision phacoemulsification with the implantation of a monofocal IQ, NT, or AT IOL. The pseudoaccommodation was measured by the lens-loading method, and the postoperative ocular higher-order aberrations were measured with a Hartmann-Shack wavefront analyzer through natural and 4 mm pupils.
  
  
  RESULTS
  Sixty eyes of 60 patients were studied. The average amplitude of the pseudoaccommodation was 0.45±0.24 D with the IQ IOL, which was significantly lower than that with the AT IOL at 0.81±0.37 D (Tukey's test; P<0.01). The differences in the amplitude of the pseudoaccommodation between the IQ and the NT IOLs, and between the NT and the AT IOLs were not significant (Tukey's test; P>0.05). The degree of spherical aberration was significantly different for the IQ, NT, and AT lenses (analysis of variance, P=0.016). The spherical aberration through the IQ IOL was significantly lower than that through the NT and the AT IOLs (Tukey's test; P<0.01). The fourth-order RMS (root mean square) aberration of the IQ lens was also significantly lower than that of the NT and AT IOLs (Tukey's test; P<0.01).
  
  
  CONCLUSIONS
  Our results suggest that the spherical aberration and selective spectral transmission of IOLs may work together to increase the amplitude of the pseudoaccommodation.
authors.affiliation: Department of Ophthalmology, Nara Medical University, Kashihara City, Nara, Japan.
authors.forename: Tomo
authors.initials: T
authors.lastname: Nishi
authors.forename: Futoshi
authors.initials: F
authors.lastname: Taketani
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Ueda
authors.forename: Nahoko
authors.initials: N
authors.lastname: Ogata
keywords: aspheric intraocular lens; higher-order aberrations; pseudoaccommodation; spheric intraocular lens