—We appreciate the comments of Dr Chopdar. Our article was designed to deal with branch retinal vein occlusions. To do this, we excluded all hemispheric retinal veinocclusions (HRVOs) without differentiating whether they were hemicentral retinal vein occlusions or hemispheric retinal vein occlusions. The HRVOs were mentioned in the "Methods" section of our article merely to indicate their exclusion. This was not an attempt to define which type of hemispheric occlusion these represented. As Dr Chopdar1 points out, hemicentral retinal vein occlusion is seen in patients with a congenital dual trunk central retinal vein, which occurs in approximately 20% of patients. However, these hemicentral retinal occlusions appear to be in the minority of all hemispheric vein occlusions and, in fact, have been suggested to be no different clinically from other HRVOs.2 Because of this confusion, we chose to exclude all HRVOs from our article.
Johnston RL, Brucker AJ, Steinmann WC. Hemispheric Retinal Vein Occlusion or Hemicentral Retinal Vein Occlusion-Reply. Arch Ophthalmol. 1986;104(8):1128–1130. doi:10.1001/archopht.1986.01050200034029
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