title: Accuracy of an automated refractor using a Hartmann-Shack sensor after corneal refractive surgery and cataract surgery.
abstract: OBJECTIVE
  To evaluate the accuracy of a new automated refractor (HRK-8000A) using the Hartmann-Shack sensor in eyes with previous corneal refractive surgery or intraocular lens (IOLs) implantation.
  
  
  METHODS
  Asan Medical Center, Seoul, South Korea.
  
  
  METHODS
  Retrospective nonrandomized clinical study.
  
  
  METHODS
  Refractive errors were evaluated after more than 1 month postoperatively. Subjective refractive error measurements were obtained by the same practitioner. Refractive error measurements were obtained with the Hartmann-Shack sensor refractor and a conventional refractor (KR 8800).
  
  
  RESULTS
  There were 121 eyes (121 patients) with previous corneal refractive surgery and 122 eyes (122 patients) with previous cataract surgery. The results of refractive error measured by the Hartmann-Shack sensor refractor were more similar to subjective refraction than those measured by the conventional refractor in both groups. In both groups, the mean spherical equivalent (SE) for the subjective refraction showed better agreement with the automated refraction measured by the Hartmann-Shack sensor refractor (limits of agreement [LoA], -0.66 to +0.65 diopters [D] and -0.47 to +0.41 D, respectively) than the automated refraction measured by the conventional refractor (LoA, -1.66 to +0.58 D and -1.34 to +0.60 D, respectively). In both groups, the Jackson cross-cylinder at axis 0 degrees and 45 degrees from the automated refraction by the Hartmann-Shack sensor refractor and conventional refractor showed similar agreement with the subjective refraction.
  
  
  CONCLUSIONS
  The Hartmann-Shack sensor automated refractor gave reliable and valid objective refraction results in patients who have had cataract or corneal refractive surgery.
  
  
  BACKGROUND
  No author has a financial or proprietary interest in any material or method mentioned.
authors.affiliation: From the Department of Ophthalmology (Jin H. Park, M.J. Kim, Jong H. Park, J.Y. Kim, Tchah), University of Ulsan College of Medicine, Asan Medical Center, and the Department of Ophthalmology (Song), Hanyang University Medical Center, Seoul, South Korea.
authors.forename: Jin Hyoung
authors.initials: JH
authors.lastname: Park
authors.affiliation: From the Department of Ophthalmology (Jin H. Park, M.J. Kim, Jong H. Park, J.Y. Kim, Tchah), University of Ulsan College of Medicine, Asan Medical Center, and the Department of Ophthalmology (Song), Hanyang University Medical Center, Seoul, South Korea. Electronic address: mjmjkim@gmail.com.
authors.forename: Myoung Joon
authors.initials: MJ
authors.lastname: Kim
authors.affiliation: From the Department of Ophthalmology (Jin H. Park, M.J. Kim, Jong H. Park, J.Y. Kim, Tchah), University of Ulsan College of Medicine, Asan Medical Center, and the Department of Ophthalmology (Song), Hanyang University Medical Center, Seoul, South Korea.
authors.forename: Jong Hoon
authors.initials: JH
authors.lastname: Park
authors.affiliation: From the Department of Ophthalmology (Jin H. Park, M.J. Kim, Jong H. Park, J.Y. Kim, Tchah), University of Ulsan College of Medicine, Asan Medical Center, and the Department of Ophthalmology (Song), Hanyang University Medical Center, Seoul, South Korea.
authors.forename: In Seok
authors.initials: IS
authors.lastname: Song
authors.affiliation: From the Department of Ophthalmology (Jin H. Park, M.J. Kim, Jong H. Park, J.Y. Kim, Tchah), University of Ulsan College of Medicine, Asan Medical Center, and the Department of Ophthalmology (Song), Hanyang University Medical Center, Seoul, South Korea.
authors.forename: Jae Yong
authors.initials: JY
authors.lastname: Kim
authors.affiliation: From the Department of Ophthalmology (Jin H. Park, M.J. Kim, Jong H. Park, J.Y. Kim, Tchah), University of Ulsan College of Medicine, Asan Medical Center, and the Department of Ophthalmology (Song), Hanyang University Medical Center, Seoul, South Korea.
authors.forename: Hungwon
authors.initials: H
authors.lastname: Tchah
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003941:Diagnostic Techniques, Ophthalmological / Q000295:instrumentation*; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D008297:Male; D008875:Middle Aged; D018918:Phacoemulsification; D012030:Refractive Errors / Q000175:diagnosis* / Q000503:physiopathology; D054140:Refractive Surgical Procedures; D015203:Reproducibility of Results; D012189:Retrospective Studies; D014792:Visual Acuity / Q000502:physiology; D055815:Young Adult