Clinical measurement and categorization of optic disc in XXXX patients.

@entity2788 @entity726
BACKGROUND: Assessment of optic disc size is an important component of optic nerve head examination. Agreement between different methods of disc size measurements is not very good. PURPOSE: To assess the agreement between the disc size assessed by @entity2788 ( @entity2788 ) and stereobiomicroscopy with a 90 diopter (D) lens. To report the clinical (measured by biomicroscopy) disc diameters of small, average and large optic discs categorized by @entity2788 disc areas. SETTING AND DESIGN: Observational study of subjects examined in the @entity726 clinic of a tertiary eye institute. MATERIALS AND METHODS: Seventy-five eyes of 75 @entity726 subjects were studied. Disc diameter was measured using stereobiomicroscopy and @entity2788 . The agreement between the two sets of measurements was assessed by intraclass correlation coefficient (ICC). Discs were classified into small (<1.6 mm(2)), average (1.6-2.6 mm(2)) and large (>2.6 mm(2)) depending on cutoffs provided by the manufacturers of @entity2788 . The means (95% CI) of the corresponding vertical disc diameter in these groups were assessed. STATISTICAL ANALYSIS: ICC, Bland and Altman plots. RESULTS: ICC for measurements of clinical and @entity2788 horizontal disc diameter was 0.518 and for vertical disc diameter measurement was 0.487. The mean difference between the clinical and @entity2788 measurements as analyzed by the Bland and Altman plot was 0.17 (95% CI, 0.13- 0.47) for horizontal and 0.22 (95% CI, 0.11- 0.54) for vertical disc diameter. Of the 75 eyes, 3 eyes had small discs, 54 average and 18 large discs. The mean clinical vertical disc diameter for small discs was 1.55 mm (95% CI, 1.2-1.7), for average discs was 1.91 mm (95% CI, 1.87-1.96) and for large discs was 2.15 mm (95% CI, 2.03-2.27). CONCLUSION: The agreement between clinical and @entity2788 disc diameter measurements is moderate. Disc diameter measurement on stereobiomicroscopy can be used to categorize discs into small, average and large discs.
