Ophthalmoscopic assessment of the size of the optic nerve papilla

Klinische Monatsblätter für Augenheilkunde
K Papastathopoulos, J B Jonas

Abstract

To examine whether the optic disc size can be measured with common ophthalmoscopic lenses. The horizontal and vertical disc diameters in 125 eyes of 65 patients were measured ophthalmoscopically using a commercial slit lamp with adjustable length of the beam and a Volk 60 diopters lens or a Volk Superfield lens. The refractive error of the subjects ranged between -7.25 D and +3.25 D (mean +/- S.D.: -0.34 +/- 1.77). Based on these measurements we calculated the optic disc area by applying a modified formula for an ellipse, where area = horizontal diameter x vertical diameter x pi/4. Additionally, we measured planimetrically the horizontal and vertical diameters of the optic disc on color stereo disc photographs after correcting the ocular and camera magnification according to Littmann's method. The values of the horizontal and vertical disc diameters evaluated on the photographs were by factors of 1.0 and 1.5 larger than those values measured with the Volk 60 D lens, and the Volk Superfield lens, respectively. Taking into account these constant linear correction factors, the optic disc diameters as measured by the Volk 60 D lens and the Volk Superfield lens varied by 0.11 +/- 0.09 mm (5.9 +/- 5.1%), and 0.11 +/- 0.09 mm (5.9 +/-...Continue Reading

Citations

Feb 20, 1999·Survey of Ophthalmology·J B JonasS Panda-Jonas
Dec 30, 1999·Progress in Retinal and Eye Research·J B Jonas, W M Budde
Sep 30, 2004·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·Siamak Ansari-Shahrezaei, Michael Stur
Dec 22, 2006·Clinical & Experimental Ophthalmology·John A LandersJamie E Craig
Sep 1, 2005·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·Fabrizio BrancaJosef Flammer

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