Normal Fundus Veasels: The First and the Second Bifurcations.

Lee, Jae Heung; Sohn, Ki Tae; Cho, Hae Wan

Original Article

Journal of the Korean Ophthalmological Society 1975;16(4):404-407.
Published online April 1, 1975.

Normal Fundus Veasels: The First and the Second Bifurcations.

Jae Heung Lee, Ki Tae Sohn, Hae Wan Cho

Department of Ophthalmology, Seoul National University Hospital, Seoul, Korea.

정상 안저혈관의 관찰 ( 제2보 ) - 제 1 및 제 2분지 부위에 대한 분석 -

이재흥 , 손기태 , 조해완 ( Jae Heung Lee , Ki Tae Sohn , Hae Wan Cho )

Abstract

Normal retinal vessels around the first and the second bifurcations were analysed with fundus photographs taken by Zeiss fundus camera. Horizontal disc diameter was set to 10, which was taken as standard units. 1. Distances of the first and the second bifurcations of the retinal vessels from the disc margin were variable; average distance being 10.01 +/- 4.83 (2.0~29.0) and 11.36 +/- 7.99 (1.5~40.0) for the first arterial and venous bifurcations, and 19.47 +/- 8.03 (5.0~42.0) and 22.84 +/- 10.49 (5.0~47.0) for the second arterial and venous bifurcations. 2. Arterial and venous diameters were: 0.56 +/- 0.11 (0.4~1.0) and 0.72 +/- 0.16 (0.5~1.1) at one to two disc diameters from the disc margins, and 0.53 +/- 0.09 (0.4~0.6) and 0.62 +/- 0.14 (0.4~0.9) at three to four disc diameters. 3. Ratio of venous to arterial diameters were 1.285 +/- 0.332 (0.57~2.00) at the first bifurcations and 1.137 +/- 0.266 (0.77~1.77) at the second bifurcations. The ratio was smaller at periphery than at central area. 4. Diameters of arteries became narrower more gradually than those of veins after bifurcations. After the second bifurcations, ratio of the sum of branched vascular diameters to the vascular diameters before bifurcations were 1.617 (0.9~3.0) for artery and 1.454 (0.9~2.8) for vein.