title: Assessment of modifications in thickness, curvatures, and volume upon the cornea caused by disposable soft contact lens wear.
abstract: OBJECTIVE
  To assess the effect of different disposable soft contact lenses on several corneal parameters-thickness, anterior and posterior curvature, and volume-by means of a Scheimpflug imaging-based device (Pentacam HR). Diurnal variations of these parameters were taken into account.
  
  
  METHODS
  Twenty-one young, healthy subjects wore 4 different types of daily disposable soft contact lenses on 4 different days: Dailies AquaComfort Plus, SofLens, Dailies Total1, and Acuvue TruEye. The lenses had different material and water content. Pachymetry and curvature maps and corneal volume values were obtained using the Pentacam HR twice a day: one before putting the lens on and one after an 8-hour period of contact lens wear. Measurements were also taken without any contact lenses being worn.
  
  
  RESULTS
  Regarding corneal thickness, the lens with the most similar behavior to the naked eye scenario was the Dailies Total1, causing a thickening of 0.2 ± 0.1% in the central zone and 0.6 ± 0.2% in the periphery. All 4 lenses caused a slight but not significant flattening in the anterior corneal curvature, whereas the posterior corneal curvature only experienced a significant but small steepening with the SofLens. The use of these lenses increased corneal volume slightly.
  
  
  CONCLUSIONS
  Variations in corneal parameters seem to depend on the type of contact lens used (material, oxygen transmissibility, water content). However, the magnitude of the changes introduced by the use of soft contact lenses over the 8-hour period was small and probably not large enough to influence either visual acuity or comfort.
authors: From the Optometry Research Group, Department of Optics, University of Valencia, Valencia - Spain.
authors: Antonio J
authors: AJ
authors: Del Águila-Carrasco
authors: Alberto
authors: A
authors: Domínguez-Vicent
authors: Cari
authors: C
authors: Pérez-Vives
authors: Teresa
authors: T
authors: Ferrer-Blasco
authors: Robert
authors: R
authors: Montés-Micó
mesh_terms: D000328:Adult; D002940:Circadian Rhythm / Q000502:physiology; D003263:Contact Lenses, Hydrophilic; D003315:Cornea / Q000473:pathology*; D063171:Corneal Pachymetry; D019781:Corneal Topography; D004209:Disposable Equipment; D005260:Female; D006801:Humans; D008297:Male; D009216:Myopia / Q000628:therapy; D009929:Organ Size; D014792:Visual Acuity / Q000502:physiology; D055815:Young Adult