| The Ability of Disc-to-Fovea Distance to Disc-Diameter Ratio to Estimate Optic Disc Size. |
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Hyun Gyu Yoo, Jae Hong Ahn, Mar Vin Lee |
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Department of Ophthalmology, Ajou University School of Medicine, Suwon, Korea. mvdevil@daum.net |
| 시신경유두직경에 대한 유두연-황반오목거리의 비를 이용한 시신경유두 크기 평가의 예측력 |
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유현규⋅안재홍⋅이마빈 |
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Department of Ophthalmology, Ajou University School of Medicine, Suwon, Korea |
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| Abstract |
PURPOSE
To investigate the usefulness of the measurement of disc-to-fovea distance to disc-diameter ratio (DF/DD ratio) in detecting large and small discs. METHODS: A total of 300 randomly selected subjects were included in the present study. All patients underwent stereoscopic disc photography and DF/DD ratio, which is the shortest distance between disc margin and fovea divided by mean disc diameter was determined by planimetry. The diagnostic accuracy of DF/DD ratio was evaluated using areas under the receiver operating characteristics curves (AUCs), sensitivity, and specificity. RESULTS: No significant differences in disc-to-fovea distance were observed among small and large disc groups. The DF/DD ratio was significantly lower in subjects with large discs (1.74 +/- 0.27) compared with subjects with small discs (2.70 +/- 0.15). AUCs of the DF/DD ratio were 0.942 and 0.947 in detecting large and small discs, respectively. In detecting disc size by a fixed DF/DD ratio of 2.0, sensitivity was 100% for both large and small discs, and specificity was 70.1% and 40.9% for the large and small discs, respectively. CONCLUSIONS: The DF/DD ratio may be a simple and useful clinical aid in detecting large and small discs. The 2.0 fixed DF/DD ratio, showed 100% sensitivity in detecting both large and small discs, although medium discs may be misdiagnosed as small discs more often than as large discs. |
| Key Words:
Disc diameter;Disc-to-fovea distance;Optic disc size;Stereoscopic disc photography |
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