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[Reproducibility of planimetric optic nerve head analysis with scanning laser ophthalmoscope]
J M Larrosa1, V Polo, L E Pablo
1Servicio de Oftalmología, Hospital Miguel Servet, Zaragoza, España.
Purpose:
To determine the variability of disc and cup area measurements in digital images obtained with scanning laser ophthalmoscope.
Methods:
10 sets of images of 4 optic discs (normal, myopic, ocular hypertensive and glaucomatous) were obtained with the Rodenstock scanning laser ophthalmoscope. Images focused at different depths were used by 2 operators (with and without experience in planimetry) to determine the disc and cup areas by means of an image analysis program (Visilog). This study was performed in 10 images obtained from the same optic nerve (inter-image analysis) and 10 times in the same image of each optic nerve (intra-image analysis).
Results:
The variability of all the measurements was under 5%. Disc area measurements were lower than cup area determination. The experienced operator obtained lower variability. The myopic optic disc images were less reproducible than the other groups of images.
Conclusions:
The planimetric analysis of optic nerve head digital images obtained with scanning laser ophthalmoscope is reproducible and allows quantification of optic disc areas.