Related Experiment Video
Updated: Mar 29, 2026
Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
Published on: September 16, 2025
Accuracy of an automated refractor using a Hartmann-Shack sensor after corneal refractive surgery and cataract
Jin Hyoung Park1, Myoung Joon Kim1, Jong Hoon Park1
1From 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.
Purpose:
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.
Setting:
Asan Medical Center, Seoul, South Korea.
Design:
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.
Conclusion:
The Hartmann-Shack sensor automated refractor gave reliable and valid objective refraction results in patients who have had cataract or corneal refractive surgery.
Financial Disclosure:
No author has a financial or proprietary interest in any material or method mentioned.
