Monocular vs. stereoscopic measurement of cup-to-disc ratios.
Stereoscopic viewing of the optic nerve head and cup has been reported to provide more reliable cup-to-disc (C/D) ratio estimates. We investigated the variability in C/D ratio estimates among three experienced optometric clinicians using conventional direct ophthalmoscopy and indirect biomicroscopy with the Volk 90 D lens. The pupils of 21 subjects were dilated and the discs assessed randomly by each examiner for the determination of the C/D ratio. Analysis of variance indicates that the two methods are not significantly different from each other when comparing interexaminer reliability. However, for a particular examiner, one method may be more effective than the other.
Rumsey
K E
KE
College of Optometry, University of Houston, Texas.
Rumsey
J M
JM
Leach
N E
NE
D000328:Adult; D000704:Analysis of Variance; D006801:Humans; D008853:Microscopy / Q000379:methods; D009887:Ophthalmoscopy; D009898:Optic Disk / Q000033:anatomy & histology*; D011897:Random Allocation