title: Soft Contact Lenses with Positive Spherical Aberration for Myopia Control.
abstract: OBJECTIVE
  To determine whether soft contact lenses with positive spherical aberration (+SA) can slow myopia progression.
  
  
  METHODS
  Eligible subjects (N = 127, primarily Asian) aged 8 to 11 years were randomized to wear either control (spherical design) or test (with +SA) soft daily disposable contact lenses for a minimum of 1 and up to 2 years (treatment phase). Subjects from the initial cohorts (N = 82) were then followed for an additional 1.5 years while wearing a marketed spherical daily disposable contact lens (withdrawal phase). Axial length and spherical equivalent cycloplegic autorefraction (SECAR) were measured at baseline and every 6 months in both phases.
  
  
  RESULTS
  During the first year of treatment, lens type (test vs. control) had a statistically significant impact on axial elongation (p = 0.0409). Eyes wearing test lenses increased in length by 0.11 (65.3%) and 0.14 (38.6%) mm less than eyes wearing control soft lenses at 6 and 12 months, respectively (p < 0.05 at both time points). The principal control of axial elongation occurred during the first 6 months. Spherical equivalent cycloplegic autorefraction change from baseline was significantly less in the test cohort than the control cohort by 0.21D (54.0%) at 6 months (p < 0.05) but not at 12 months (0.14D, p > 0.05). Lens type was not overall a significant factor affecting refractive error change (p = 0.0677). After ceasing treatment, neither the rate of axial elongation nor change in SECAR was significantly different between the initial two cohorts.
  
  
  CONCLUSIONS
  The soft contact lens with +SA slowed axial growth of the eye, although this did not translate into a sustained statistically significant effect on SECAR. The majority of the treatment effect occurred in the initial 6 months of wear. No evidence of rebound effect was observed after ceasing treatment.
authors.affiliation: *MD, PhD, FAAO †PhD ‡MS §OD, FAAO ∥MScOptom, PhD, FAAO Johnson and Johnson Vision Care, Inc., Jacksonville, Florida (XC, JX, KC, NB); and Korb & Associates, Boston, Massachusetts (JE).
authors.forename: Xu
authors.initials: X
authors.lastname: Cheng
authors.forename: Jing
authors.initials: J
authors.lastname: Xu
authors.forename: Khaled
authors.initials: K
authors.lastname: Chehab
authors.forename: Joan
authors.initials: J
authors.lastname: Exford
authors.forename: Noel
authors.initials: N
authors.lastname: Brennan
mesh_terms: D058452:Axial Length, Eye; D002648:Child; D003263:Contact Lenses, Hydrophilic; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008297:Male; D009216:Myopia / Q000175:diagnosis / Q000517:prevention & control*; D054158:Orthokeratologic Procedures; D011446:Prospective Studies; D011474:Prosthesis Design; D012029:Refraction, Ocular / Q000502:physiology