title: Posterior chamber phakic intraocular lenses to correct high myopia: a comparative study between Staar and Adatomed models.
abstract: OBJECTIVE
  To determine the feasibility of using posterior chamber phakic intraocular lenses (PIOLs) to treat high myopia, comparing two different models, Staar and Adatomed.
  
  
  METHODS
  Twenty-four eyes from 12 patients were studied prospectively. A phakic Staar IOL was implanted in one eye of each patient, and the other eye received a phakic Adatomed IOL. Patients with uveitis or ocular trauma prior to ocular surgery, diabetic retinopathy, or capsular pseudoexfoliation were excluded. The mean preoperative spherical equivalent refraction was -16.00 +/- 5.05 D for the Staar group and -15.39 +/- 2.83 D for the Adatomed group. Average follow-up was 32.4 months (range, 19 to 46 mo) for the Adatomed group and 18.3 months (range, 11 to 21 mo) for the Staar group and included evaluation of intraocular pressure, intraocular lens pigment deposits, lens decentration, anterior subcapsular cataract, and visual acuity.
  
  
  RESULTS
  Spectacle-corrected and uncorrected visual acuity improved in all eyes in both groups. No statistically significant differences in visual acuity gain were observed with the two materials (Student t-test, P = .08 for the Staar group and P = .6 for the Adatomed group), although the gain in visual acuity was somewhat greater with the Staar PIOLs. The difference in mean intraocular pressure before surgery and at last follow-up was 1.5 mmHg for the Staar group and 2.3 mmHg for the Adatomed group (P = .36). The incidence of lens pigment deposits was the same in both groups (41.66%), with deposits in 5 of the 12 eyes in both groups. The incidence of lens decentration was higher in the Adatomed group (5/12; 41.66%) than in the Staar group (2/12; 16.7%). Anterior subcapsular cataract was higher in the Adatomed group (4/12; 33.3%) than in the Staar group (3/12; 25%).
  
  
  CONCLUSIONS
  There was a higher incidence of lens decentration and anterior subcapsular cataract in the Adatomed group than in the Staar group.
authors.affiliation: Department of Surgery, University of Valencia, School of Medicine, Spain.
authors.forename: J L
authors.initials: JL
authors.lastname: Menezo
authors.forename: C
authors.initials: C
authors.lastname: Peris-Martínez
authors.forename: A
authors.initials: A
authors.lastname: Cisneros
authors.forename: R
authors.initials: R
authors.lastname: Martínez-Costa
mesh_terms: D000328:Adult; D002386:Cataract / Q000209:etiology; D005240:Feasibility Studies; D005260:Female; D005500:Follow-Up Studies; D005548:Foreign-Body Migration / Q000209:etiology; D006801:Humans; D007429:Intraocular Pressure; D007903:Lens Capsule, Crystalline / Q000473:pathology; D019654:Lens Implantation, Intraocular / Q000009:adverse effects; D007908:Lens, Crystalline; D007910:Lenses, Intraocular; D008297:Male; D009216:Myopia / Q000601:surgery*; D011183:Postoperative Complications; D012029:Refraction, Ocular; D014792:Visual Acuity