Af. Spencer et Sa. Vernon, OPTIC DISC MEASUREMENT - A COMPARISON OF INDIRECT OPHTHALMOSCOPIC METHODS, British journal of ophthalmology, 79(10), 1995, pp. 910-915
Aims-Two methods of indirect-ophthalmoscopic estimation of optic disc
size, the 78 dioptre lens and optic disc biometer were evaluated. Meth
ods-Twenty nine eyes of 29 patients were measured by both methods and
compared with optic disc size calculated using the three planimetric c
orrections described by Bengtsson and Krakau. Results-The closest agre
ement with the clinical measurements was found using correction 3. The
re was a significant difference between both the 78 D lens (p<0.0001)
and the biometer (p=0.0027) and the planimetric results. There was als
o a significant difference between the two clinical methods (p<0.0001)
. Both methods showed acceptable intraobserver variation (GoV 2.45% an
d 3.13% respectively) . Conclusion-Overall, both methods give larger m
easurements than planimetry; the 78 D lens by 0.41 mm and the biometer
by 0.15 mm. Neither method gives a satisfactory estimation of optic d
isc size when compared with planimetry.