title: Changes in higher-order aberrations after iris-fixated phakic intraocular lens implantation.
abstract: OBJECTIVE
  To evaluate surgically induced changes in corneal, internal, and ocular higher-order aberrations (HOAs) after phakic intraocular lens (PIOL) implantation and compare them between two PIOLs with different pupillary diameters.
  
  
  METHODS
  Twenty-three eyes with an Artisan PIOL (Ophtec BV, Groningen, The Netherlands) (Artisan group) and 30 eyes with an Artiflex PIOL (Ophtec BV) (Artiflex group) were retrospectively evaluated. The corneal, internal, and ocular HOAs and refractive data were recorded preoperatively and 6 months postoperatively. The root mean squares (RMSs) of the total HOAs from the third- to sixth-order Zernike coefficients were calculated. The RMSs of the third- and fourth-order coefficients represented coma-like aberrations (S3) and spherical-like aberrations (S4), respectively. The main outcome measures were the differences in the parameters among the groups with different pupillary diameters.
  
  
  RESULTS
  The mean postoperative spherical equivalents decreased from -11.84 ± 4.90 to -0.16 ± 0.40 diopters and -9.78 ± 3.20 to -0.09 ± 0.26 diopters in the Artisan and Artiflex groups, respectively. With the 4- and 5-mm pupillary diameters, the postoperative internal and ocular spherical aberrations (Z4(0)) were significantly lower in the Artiflex group than in the Artisan group (4 mm, P = .002, .024; 5 mm, P = .004, .022, respectively). With the 6-mm pupillary diameter, there were no significant postoperative differences in any parameter measured between groups; both groups had positive spherical aberration values.
  
  
  CONCLUSIONS
  The postoperative ocular spherical aberrations were positive after Artisan and Artiflex implantation. The postoperative ocular spherical aberration was greater in the Artisan group, possibly due to differences in the SAs of both PIOLs.
authors: Hidemasa
authors: H
authors: Torii
authors: Kazuno
authors: K
authors: Negishi
authors: Kazuhiro
authors: K
authors: Watanabe
authors: Megumi
authors: M
authors: Saiki
authors: Naoko
authors: N
authors: Kato
authors: Kazuo
authors: K
authors: Tsubota
mesh_terms: D000328:Adult; D019781:Corneal Topography; D057108:Corneal Wavefront Aberration / Q000175:diagnosis / Q000209:etiology* / Q000503:physiopathology; D005260:Female; D006801:Humans; D007498:Iris / Q000601:surgery*; D019654:Lens Implantation, Intraocular / Q000009:adverse effects*; D007910:Lenses, Intraocular; D008297:Male; D009216:Myopia / Q000601:surgery; D054120:Phakic Intraocular Lenses; D011474:Prosthesis Design; D011680:Pupil / Q000502:physiology; D012029:Refraction, Ocular / Q000502:physiology; D012189:Retrospective Studies; D014792:Visual Acuity / Q000502:physiology