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In reply

In his letter, Dr Hayreh raises a number of interesting points related to our article, "Radial Optic Neurotomy for Management of Hemicentral Retinal Vein Occlusion,"¹ based on his extensive research and clinical studies over the last several decades.

As described by Hayreh and Hayreh² in an article on the natural history of 41 patients with HCRVO, around 16 (40%) of the cases had retinociliary collateral vessels at the time the condition was diagnosed and 29 (75%) showed collateral vessels during follow-up. Nevertheless, Hayreh and Hayreh do not specify the time of evolution of HCRVO at the initial examination; hence, some of the patients might have had visual symptoms for several months before the initial evaluation. Fuller et al³ found that cilioretinal collateral vessels appear spontaneously at around 6.7 months in patients with CRVO. In our experience of 20 cases of HCRVO¹ diagnosed among 232 retinal vein occlusions, no . . . [Full Text of this Article]

AUTHOR INFORMATION
Jose García-Arumí, MD; Anna Boixadera, MD; Vicente Martínez-Castillo, MD

RELATED LETTER

Radial Optic Neurotomy for Management of Hemicentral Retinal Vein Occlusion
Sohan Singh Hayreh
Arch Ophthalmol. 2006;124(12):1798-1799.
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Radial Optic Neurotomy for Management of Hemicentral Retinal Vein Occlusion
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Hemi-central retinal vein occulsion. Pathogenesis, clinical features, and natural history
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