title: Clinical evaluation of the L80 autorefractometer.
abstract: BACKGROUND
  A clinical evaluation of the L80 wave+ autorefractometer (Visionix Luneau, Chartres, France) was performed to evaluate its validity and repeatability compared with non-cycloplegic subjective refraction. The L80 wave+ autorefractometer is a new instrument based on the Hartmann-Shack principle that has a specific autorefraction function using the wavefront device and can also measure keratometry, topography of the cornea and higher-order aberrations.
  
  
  METHODS
  Refractive error measurements were obtained from 100 eyes of 50 subjects (age, 25 ± 2.71 years) subjectively by one masked practitioner and objectively with the L80 wave+ autorefractometer (with a 3.0 mm pupil) by a second practitioner. Intra-test and inter-test (within a week after the initial objective measures) variability was assessed on 28 new subjects (56 eyes).
  
  
  RESULTS
  The results of the objective and subjective measurements of refractive error were very similar (mean difference 0.03 ± 0.47 D, p = 0.49 for sphere; 0.05 ± 0.27 D, p = 0.06 for cylinder; 0.06 ± 0.44 D, p = 0.20 for spherical equivalent; 0.01 ± 0.13 D, p = 0.37 for J(0) and -0.005 ± 0.12 D, p = 0.69 for J(45) ). High intra-test and inter-test repeatability were demonstrated for all parameters measured and found comparable with other clinical autorefractors.
  
  
  CONCLUSIONS
  The L80 wave+ autorefractometer represents a reliable and valid objective refractive tool for general optometric practice.
authors.affiliation: Department of Optometry, Hadassah Academic College, 37 Hanevi’im Street, Jerusalem, Israel.
authors.forename: Einat
authors.initials: E
authors.lastname: Shneor
authors.forename: Michel
authors.initials: M
authors.lastname: Millodot
authors.forename: Ortal
authors.initials: O
authors.lastname: Avraham
authors.forename: Shany
authors.initials: S
authors.lastname: Amar
authors.forename: Ariela
authors.initials: A
authors.lastname: Gordon-Shaag
mesh_terms: D057128:Aberrometry / Q000295:instrumentation*; D000293:Adolescent; D000328:Adult; D001331:Automation / Q000295:instrumentation*; D003315:Cornea / Q000503:physiopathology*; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D009216:Myopia / Q000175:diagnosis* / Q000503:physiopathology; D012029:Refraction, Ocular; D015203:Reproducibility of Results; D055815:Young Adult