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Effects of Measurement Center Shift on Ganglion Cell–inner Plexiform Layer Thickness Measurements

Kim, Kyoung-Nam, MD1; Shin, Il-Hwan, MD1; Kwak, Baek-Soo, MD2; Sung, Jae-Yun, MD1; Lim, Hyung-Bin, MD1; Jo, Young-Joon, MD1,3; Kim, Jung-Yeul, MD1,3*

doi: 10.1097/OPX.0000000000001251
Original Investigations

SIGNIFICANCE Our authors studied the effects of measurement center shift on ganglion cell–inner plexiform layer (GCIPL) thickness measurements in Cirrus spectral-domain optical coherence tomography (SD-OCT). The measurement center shift affects the GCIPL thickness measurement depending on the distance of shift.

PURPOSE The purpose of this study was to explore changes in macular GCIPL thicknesses measurements after manual shifting of the measurement center using SD-OCT.

METHODS A prospective study was conducted. A total of 30 normal eyes of 30 subjects were included in the study. An experienced examiner obtained two consecutive measurements of GCIPL thickness using SD-OCT. Coefficients of repeatability were calculated for the average, minimum, and sectoral (superotemporal, superior, superonasal, inferonasal, inferior, and inferotemporal) thicknesses. Next, the measurement center was manually shifted from the foveal center. Three measurement centers were horizontally placed at 59-μm intervals from the foveal center, and two further centers were placed 176 μm apart. Also, three measurement centers were vertically placed at 47-μm intervals from the foveal center, and two further centers were placed 142 μm apart. The thickness of GCIPL was measured again at each shift point, and the changes of thickness before and after movement were analyzed.

RESULTS When the measurement centers were shifted to positions 59 μm horizontally or 47 μm vertically from the fovea, no significant changes in GCIPL thicknesses were evident. However, upon more pronounced shifting, the average GCIPL thickness of the direction of the shift region was significantly lower than baseline, whereas the GCIPL of the diametrically opposite sector was thicker than baseline.

CONCLUSIONS The impact of changes associated with shifting of the measurement center should be taken into consideration when measuring GCIPL thickness in patients with retinal diseases, glaucoma, or neuro-ophthalmological conditions.

1Department of Ophthalmology, Chungnam National University College of Medicine, Daejeon, Republic of Korea

2Department of Computer Engineering, San Jose State University, San Jose, California

3Research Institute for Medical Science, Chungnam National University College of Medicine, Daejeon, Republic of Korea *

Submitted: April 7, 2017

Accepted: May 22, 2018

Funding/Support: None of the authors have reported funding/support.

Conflict of Interest Disclosure: The authors declare that there are no conflict of interests regarding the publication of this paper.

Author Contributions: Conceptualization: K-NK, Y-JJ, J-YK; Data Curation: K-NK, B-SK, H-BL; Formal Analysis: B-SK, J-YS; Investigation: I-HS, J-YS; Methodology: B-SK; Supervision: K-NK, J-YK; Visualization: B-SK; Writing – Original Draft: K-NK, I-HS, J-YK; Writing – Review & Editing: K-NK, H-BL, Y-JJ, J-YK.

© 2018 American Academy of Optometry