title: Pilot study of new focus-shift accommodating intraocular lens.
abstract: OBJECTIVE
  To determine the visual and accommodative performance of the OPAL-A focus-shift accommodating intraocular lens (IOL).
  
  
  METHODS
  Department of Ophthalmology, St. Thomas' Hospital, London, United Kingdom.
  
  
  METHODS
  In this study comprising unilateral phacoemulsification and accommodating IOL implantation, patients were followed for 6 months. Corrected distance (CDVA) and distance-corrected near (DCNVA) visual acuities were measured. Objective amplitude of accommodation was measured with an autorefractor and subjective amplitude of accommodation, using push-up tests and defocus curves. Physiological and pilocarpine-stimulated IOL movement was measured by anterior segment optical coherence tomography.
  
  
  RESULTS
  The mean values at 1 month, 3 months, and 6 months, respectively, were as follows: CDVA, -0.06 +/- 0.08 (SD), -0.08 +/- 0.09, and -0.05 +/- 0.09; DCNVA, 0.31 +/- 0.15, 0.31 +/- 0.15, and 0.34 +/- 0.16; objective amplitude of accommodation, 0.36 +/- 0.38 diopters (D), 0.12 +/- 0.34 D, and 0.10 +/- 0.34 D; subjective amplitude of accommodation, 2.79 +/- 0.86 D, 2.55 +/- 0.85 D, and 2.50 +/- 0.62 D with push-up test and 0.90 +/- 0.40 D, 0.78 +/- 0.23 D, and 0.93 +/- 0.35 D with defocus curves. The maximum physiologic IOL shift at 1 month (mean 45.2 +/- 63.4 microm) occurred with a 3.0 D accommodative stimulus. At 6 months, the mean pilocarpine-stimulated forward IOL shift was 306 +/- 161 microm.
  
  
  CONCLUSIONS
  Objective accommodation and forward axial shift were clinically insignificant with the accommodating IOL. The near visual performance was attributed to depth of focus rather than to true pseudophakic accommodation.
authors.affiliation: Department of Ophthalmology, St. Thomas' Hospital, London, United Kingdom.
authors.forename: Georgia
authors.initials: G
authors.lastname: Cleary
authors.forename: David J
authors.initials: DJ
authors.lastname: Spalton
authors.forename: John
authors.initials: J
authors.lastname: Marshall
mesh_terms: D000065:Accommodation, Ocular / Q000502:physiology*; D000869:Anterior Eye Segment / Q000473:pathology; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D018918:Phacoemulsification; D010865:Pilot Projects; D011446:Prospective Studies; D011474:Prosthesis Design; D019591:Pseudophakia / Q000503:physiopathology*; D041623:Tomography, Optical Coherence; D014792:Visual Acuity / Q000502:physiology*