The Ability of Disc-to-Fovea Distance to Disc-Diameter Ratio to Estimate Optic Disc Size.
10.3341/jkos.2013.54.6.913
- Author:
Hyun Gyu YOO
1
;
Jae Hong AHN
;
Mar Vin LEE
Author Information
1. Department of Ophthalmology, Ajou University School of Medicine, Suwon, Korea. mvdevil@daum.net
- Publication Type:Original Article
- Keywords:
Disc diameter;
Disc-to-fovea distance;
Optic disc size;
Stereoscopic disc photography
- MeSH:
Area Under Curve;
Humans;
Photography;
ROC Curve;
Sensitivity and Specificity
- From:Journal of the Korean Ophthalmological Society
2013;54(6):913-918
- CountryRepublic of Korea
- Language:Korean
-
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.
