Validity and Accuracy of Hartmann-Shack Wavefront Sensor-Based Autorefractor

Won, Hunjae

Validity and Accuracy of Hartmann-Shack Wavefront Sensor-Based Autorefractor

Saturday, April 26, 2014: 3:16 PM

Room 152 (Boston Convention and Exhibition Center)

Hunjae Won, MD, Asan Medical Center, Seoul, South Korea

Myoung Joon Kim, MD, Asan Medical Center, Seoul, Korea, Republic of

Jin Hyoung Park, MD, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea, Seoul, South Korea

In Seok Song, MD, Asan medical center, Seoul, Korea, Seoul, South Korea

Jong Hoon Park, MD, Asan medical center, Seoul, South Korea

Jae Yong Kim, MD, PhD, Asan Medical Center, Seoul, South Korea

Hungwon Tchah, MD, Asan Medical Center, Seoul, Korea, Republic of

Narrative Responses:

Purpose
To evaluate the validity and accuracy of an autorefractor using Hartmann-Shack wavefront sensor (H-S sensor) in normal eyes, in post-refractive surgery eyes and pseudophakic eyes.

Methods
This study enrolled 96 normal eyes without history of ophthalmic surgery (Group 1), 37 eyes which underwent laser refractive surgery (Group 2), and 41 pseudophakic eyes (Group 3). Manifest refraction (MR) was performed by one examiner. Refractive errors were obtained by a H-S sensor-based autorefractor (HRK-8000A, Huvitz, Korea) and a conventional autorefractor (KR-8800, Topcon, Japan). Higher-order aberrations (HOAs) up to 4^th order were measured by HRK-8000A and OPD-Scan III (Nidek, Japan).

Results
In all groups, spherical errors measured by HRK-8000A were not different from MR (P=0.130, 0.990, 0.511 in Group 1, 2, and 3 respectively). There were statistically significant differences in spherical errors between KR-8800 and MR (P=0.000, 0.002, 0.005 in Group 1, 2, and 3). In group 1, cylindrical errors measured by both autorefractors were different from MR (P=.000, P=.000, respectively). In group 2 and 3, cylindrical errors measured by both autorefractors were not different from MR (P>0.05). In all groups, HOAs showed no statistical difference between HRK-8000A and OPD-Scan III.

Conclusion
A H-S sensor-based autorefractor could measure spherical errors more accurately compared to a conventional autorefractor. It also showed a performance comparable to a verified aberrometer in measurement of HOAs.