Overview
An impending central retinal vein occlusion may be asymptomatic or may cause a mild blurring of the vision. In cases where vision is affected, it may be worse on waking then improving throughout the day.
The clinical signs of an impending vein occlusion may be subtle. Similar to an full CRVO, an impending occlusion typically shows unilateral dilation and tortuosity of the retinal veins. The best way to identify this is to compare the right and left eyes.
There may also be scattered blot and dot haemorrhages, however there are significantly fewer than in a complete CRVO. Disc oedema may also be present.
Case Examples
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Case 1
A 40 year old Middle Eastern male who was diagnosed with a genetic blood clotting disorder 3 months ago. He is asymptomatic with best corrected visual acuity of 6/6 (20/20).
Differential diagnosis
References
Invernizzi A, Pellegrini M, Giani A, et al (2013) Multi-imaging interpretation in impending central retinal vein occlusionBritish Journal of Ophthalmology 97:1080.
Lee, D. H., Lee, S. J., & Yoon, I. (2010). Clinical progress in impending central retinal vein occlusion. Korean journal of ophthalmology : KJO, 24(2), 83–88.