| Accuracy of Optic Disc Parameters Obtained by the Heidelberg Retina Tomograph in the Diagnosis of Glaucoma. |
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Jae Yeon Jun, Jeong Hee Hwang, Hyung Ju Park, Ki Bang Uhm |
1Department of Ophthalmology, Kangbuk Samsung Hospital, Sungkyunkwan University College of Medicine, Seoul, Korea.
2Department of Ophthalmology, Hanyang University College of Medicine, Seoul, Korea. KBUhm@hanyang.ac.kr |
| 녹내장 진단에서 Heidelberg Retina Tomograph로 구한 시신경 계측치들의 정확도 |
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전재연 ( Jae Yeon Jun ) , 황정희 ( Jeong Hee Hwang ) , 박형주 ( Hyung Ju Park ) , 엄기방 ( Ki Bang Uhm ) |
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| Abstract |
PURPOSE
To determine which optic disc topographic parameters, obtained by the Heidelberg Retina Tomograph (HRT), are most useful to distinguish normal eyes from those with early to moderate glaucomatous visual field defects. METHODS: From each of 92 normal subjects and 154 patients with primary open-angle glaucoma one randomly selected eye was studied. The Humphrey perimeter, program C 30-2 visual fields, and 13 HRT parameters (software 2.01, includes rim to disc area ratio) were utilized. Because some of the optic disc parameters depend on the optic disc area, these parameters were corrected for the effect of disc area. The total glaucoma group was divided into three subgroups according to the visual field defects: early (mean deviation [MD] >-6 dB, 65 eyes), moderate (MD -6 to -12 dB, 49 eyes), and severe (MD <-12 dB, 40 eyes) glaucoma groups. RESULTS: In eyes with early glaucoma (MD = -3.43 +/- 1.60 dB), the sensitivity, specificity, accuracy, and areas under the receiver operating characteristic curve were, respectively: rim area (69%, 71%, 70%, 0.802), rim to disc area ratio (69%, 72%, 71%, 0.799), cup area (72%, 70%, 71%, 0.789) and cup to disc area ratio (69%, 70%, 69%, 0.790). In eyes with moderate glaucoma (MD = -8.75 +/- 1.88 dB), they were, respectively: rim area (78%, 86%, 83%, 0.872), rim to disc area ratio (76%, 86%, 82%, 0.869), cup area (76%, 87%, 83%, 0.864) and cup to disc area ratio (78%, 84%, 82%, 0.862). There was considerable overlap in HRT parameters between the normal and early glaucoma groups. CONCLUSIONS: The diagnostic value of single optic disc parameter had its limitations in the diagnosis of early stage glaucoma. |
| Key Words:
Glaucoma;Heidelberg Retina Tomograph;Optic disc;Sensitivity;Specificity |
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