title: Intrasubject repeatability of internal aberrometry obtained with a new integrated aberrometer.
abstract: OBJECTIVE
  To evaluate the intrasubject repeatability of the internal aberrometry obtained with a new integrated aberrometer in a sample of normal eyes to assess its clinical usefulness.
  
  
  METHODS
  Twenty-six healthy eyes of 26 participants, aged 20 to 50 years, were included in the study. All eyes achieved corrected distance visual acuity of 1.0 (Snellen decimal notation) and did not undergo previous ocular surgeries. Three consecutive measurements of internal aberrations were obtained with the KR-1W system (Topcon Corp) by an experienced examiner. Intrasubject repeatability for 4- and 6-mm pupils was evaluated by the within-subject standard deviation (S(w)) and intraclass correlation coefficient (ICC).
  
  
  RESULTS
  Low values of S(w) and values of ICC close to 1 were found for the 4-mm pupil astigmatism and for several aberrometric coefficients: primary spherical aberration and higher order, third order, and trefoil root-mean-square (RMS). Significant correlations of the S(w) for the 4-mm pupil higher order aberrations RMS with the magnitude of different aberrometric coefficients were found (r≥0.611, P<.01). In addition, tetrafoil RMS for 4-mm pupils correlated significantly with the S(w) for some higher order errors (r≥0.675, P<.01). Significantly larger values of S(w) for 6-mm pupils were found for trefoil (P<.01) and secondary astigmatism RMS (P=.02).
  
  
  CONCLUSIONS
  The KR-1W provided repeatable measurements of internal astigmatism and some higher order aberrations, although consistency of such measurements appears to be limited by the level of aberration.
authors.affiliation: Departamento de Optica, Universidad de Alicante, Alicante, Spain. dpinero@vissum.com
authors.forename: David P
authors.initials: DP
authors.lastname: Piñero
authors.forename: Javier Tomás
authors.initials: JT
authors.lastname: Juan
authors.forename: Jorge L
authors.initials: JL
authors.lastname: Alió
mesh_terms: D057128:Aberrometry / Q000295:instrumentation*; D000328:Adult; D001251:Astigmatism / Q000175:diagnosis* / Q000503:physiopathology; D003315:Cornea / Q000473:pathology*; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012029:Refraction, Ocular; D015203:Reproducibility of Results; D014792:Visual Acuity; D055815:Young Adult