Retinal branch vein occlusion. Changes at the site of obstruction.

Abstract

Obstruction in retinal branch veins usually occurs in relation to arterio-venous crossings (Moore, 1924; Jensen, I936), and intramural thrombosis has been postulated as a frequent cause (Moore, I924; Koyanagi, 1928; Jensen, I936). Histological studies have failed, however, to show thrombosis but have demonstrated focal venous obstruction (Seitz, I964; Rabinowicz, Litman, and Michaelson, I968)