title: Objective and subjective visual performance of multifocal contact lenses: pilot study.
abstract: OBJECTIVE
  The aim of the present study was to compare the objective and subjective visual performance of three different soft multifocal contact lenses.
  
  
  METHODS
  10 subjects (habitual soft contact lens wearers) between the ages of 40 and 45 years participated in the study. Three different multifocal silicone hydrogel contact lenses (Acuvue Oasys, Air Optix and Biofinity) were fit within the same visit. All the lenses were fit according to the manufacturers' recommendation using the respective fitting guide. Visual performance tests included low and high contrast distance and near visual acuity, contrast sensitivity, range of clear vision and through-focus curve. Objective visual performance tests included measurement of open field accommodative response at different defocus levels and optical aberrations at different viewing distances.
  
  
  RESULTS
  Accommodative response was not significantly different between the three types of multifocal contact lenses at each of the accommodative stimulus levels (p>0.05). Accommodative lag increased for higher stimulus levels for all 3 types of contact lenses. Ocular aberrations were not significantly different between these 3 contact lens designs at each of the different viewing distances (p>0.05). In addition, optical aberrations did not significantly differ between different viewing distances for any of these lenses (p>0.05). ANOVA revealed no significant difference in high and low contrast distance visual acuity as well as near visual acuity and contrast sensitivity function between the 3 multifocal contact lenses and spectacles (p>0.05).
  
  
  CONCLUSIONS
  There was no statistically significant difference in accommodative response, optical aberrations or visual performance between the 3 multifocal contact lenses in early presbyopes.
authors.affiliation: College of Optometry, Midwestern University, Glendale, AZ 85308, USA. Electronic address: bvasud@midwestern.edu.
authors.forename: Balamurali
authors.initials: B
authors.lastname: Vasudevan
authors.affiliation: College of Optometry, Midwestern University, Glendale, AZ 85308, USA.
authors.forename: Michael
authors.initials: M
authors.lastname: Flores
authors.affiliation: College of Optometry, Midwestern University, Glendale, AZ 85308, USA.
authors.forename: Sara
authors.initials: S
authors.lastname: Gaib
mesh_terms: D000328:Adult; D000368:Aged; D003261:Contact Lenses; D019544:Equipment Failure Analysis; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010865:Pilot Projects; D011474:Prosthesis Design; D012030:Refractive Errors / Q000175:diagnosis* / Q000534:rehabilitation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D016896:Treatment Outcome; D014792:Visual Acuity
keywords: Accommodative response; Contrast sensitivity; Multifocal; Optical aberrations; Presbyopia; Visual performance