title: In vivo chromatic aberration in eyes implanted with intraocular lenses.
abstract: OBJECTIVE
  To measure in vivo and objectively the monochromatic aberrations at different wavelengths, and the chromatic difference of focus between green and infrared wavelengths in eyes implanted with two models of intraocular lenses (IOL).
  
  
  METHODS
  EIGHTEEN EYES PARTICIPATED IN THIS STUDY: nine implanted with Tecnis ZB99 1-Piece acrylic IOL and nine implanted with AcrySof SN60WF IOL. A custom-developed laser ray tracing (LRT) aberrometer was used to measure the optical aberrations, at 532 nm and 785 nm wavelengths. The monochromatic wave aberrations were described using a fifth-order Zernike polynomial expansion. The chromatic difference of focus was estimated as the difference between the equivalent spherical errors corresponding to each wavelength.
  
  
  RESULTS
  Wave aberration measurements were highly reproducible. Except for the defocus term, no significant differences in high order aberrations (HOA) were found between wavelengths. The average chromatic difference of focus was 0.46 ± 0.15 diopters (D) in the Tecnis group, and 0.75 ± 0.12 D in the AcrySof group, and the difference was statistically significant (P < 0.05). Chromatic difference of focus in the AcrySof group was not statistically significantly different from the Longitudinal chromatic aberration (LCA) previously reported in a phakic population (0.78 ± 0.16 D). The impact of LCA on retinal image quality (measured in terms of Strehl ratio) was drastically reduced when considering HOA and astigmatism in comparison with a diffraction-limited eye, yielding the differences in retinal image quality between Tecnis and AcrySof IOLs not significant.
  
  
  CONCLUSIONS
  LRT aberrometry at different wavelengths is a reproducible technique to evaluate the chromatic difference of focus objectively in eyes implanted with IOLs. Replacement of the crystalline lens by the IOL did not increase chromatic difference of focus above that of phakic eyes in any of the groups. The AcrySof group showed chromatic difference of focus values very similar to physiological values in young eyes.
authors.affiliation: Instituto de Óptica ‘‘Daza de Valdés,’’ Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain
authors.forename: Pablo
authors.initials: P
authors.lastname: Pérez-Merino
authors.forename: Carlos
authors.initials: C
authors.lastname: Dorronsoro
authors.forename: Lourdes
authors.initials: L
authors.lastname: Llorente
authors.forename: Sonia
authors.initials: S
authors.lastname: Durán
authors.forename: Ignacio
authors.initials: I
authors.lastname: Jiménez-Alfaro
authors.forename: Susana
authors.initials: S
authors.lastname: Marcos
mesh_terms: D000368:Aged; D005260:Female; D006801:Humans; D007910:Lenses, Intraocular / Q000009:adverse effects*; D008297:Male; D011474:Prosthesis Design; D011475:Prosthesis Failure; D019591:Pseudophakia / Q000503:physiopathology*; D012029:Refraction, Ocular; D012030:Refractive Errors / Q000209:etiology* / Q000503:physiopathology; D014792:Visual Acuity