An 18 year old boy comes to the eye casuality with history of injury with a tennis ball. On examination there is no perforation but there is hyphaema. The most likely source of the blood is: (A) Iris vessels., (B) Circulus iridis major., (C) Circulus iridis minor, (D) Sho posterior ciliary vessels.
Answer is B. B i.e. Circulus iridis major A tear at the anterior aspect of the ciliary body is the most common site of bleeding (70%) in contusion injuries of eye. The major sources of bleeding are - circularis iridis major Q (due to tear between longitudinal & circular fibres of ciliary muscle) > circularis iridis minor (in sphincter tear) > radial vessels (associated with iridodialysis) Circularis iridis major is situated along the ciliary margin of iris and circularis iridis minor along the pupillary margin of iris.