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Diagnostic Value of GDx Polarimetry in a Taiwan Chinese Population


Optometry and Vision Science: July 2007 - Volume 84 - Issue 7 - p 640-646
doi: 10.1097/OPX.0b013e3180dc9a00
Original Article

Purpose. To study the diagnostic ability of scanning laser polarimetry with variable corneal compensation (GDx VCC) for early glaucomatous (EG) eyes and glaucoma-suspect (GS) eyes in a Taiwan Chinese population.

Methods. This prospective cross-sectional study included 82 EG eyes (mean deviation, MD: −3.32 ± 2.20 dB), 45 GS eyes (MD: −2.43 ± 2.16 dB), and 62 normal eyes. Retinal nerve fiber layer thickness of each subject was measured using GDx VCC and Humphrey Field Analyzer visual field testing. Measured GDx VCC parameters were compared among groups. The area under the receiver operating characteristic (AROC) curve of each parameter was used to differentiate normal from EG eyes or GS eyes. The correlation between MD and each parameter was also evaluated.

Results. For both normal versus EG and normal versus GS, the largest AROC values were for nerve fiber indicator, superior average thickness, and inferior average thickness. There was no significant correlation between MD and GDx-VCC-measured parameters either in EG or GS eyes.

Conclusions. GDx VCC shows only moderate ability to distinguish normal eyes from eyes with early glaucoma. However, its diagnostic role in eyes with suspicious discs and normal visual fields is uncertain at this moment in the Taiwan Chinese population. Further studies are needed to address this issue.

Department of Ophthalmology, China Medical University Hospital, Taiching City, Taiwan (H-YC, Y-YT, P-TH), and Department of Industrial Engineering and Management, National Chin-Yi University of Technology, Taiwan (M-LH)

Received October 12, 2006; accepted April 10, 2007.

© 2007 American Academy of Optometry