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The Use of the Non-Mydriatic Fundus Camera in Glaucoma Evaluation

Created 2009-11-23 03:42:29 by คุณ System Administrator 319 Views

Objective: To evaluate the use of the non-mydriatic fundus camera in evaluation of optic nerve head vertical cup to disc ratio in glaucoma patients. Design: Cross-sectional descriptive comparative study Material and Method: Indirect ophthalmoscopy with 78 diopter lens and a digital non-mydriatic fundus camera were performed in forty two subjects (23 normal controls and 19 glaucoma). The estimated vertical cup to disc ratio (VCDR) from both methods were analyzed. The effect of the pupillary dilation on the estimation of VCDR from non-mydriatic fundus camera was also determined. Result: The mean ophthalmoscopically estimated VCDR was (mean ? SD) 0.479 ? 0.18, compared with a VCDR of (mean ? SD) 0.462 ? 0.18, measured with the non-mydriatic fundus camera (difference 0.017; 95% confidence interval [CI], 0.005-0.028; p=0.007). The overall correlation between the non-mydriatic fundus camera and indirect ophthalmoscopy with 78 D lens is 0.895 (p<0.001). From the receiver operating curve (ROC) at 90% specificity, the estimated VCDR from the non-mydriatic fundus camera yielded 68.4% sensitivity. Conclusion: The non-mydriatic fundus camera provided good correlation with minimal difference in the estimated VCDR, when compared with the standard indirect ophthalmoscopy with a 78 D lens. In conjunction with IOP measurement, a non-mydriatic fundus camera can make a useful tool for glaucoma screening.
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