Clinical presentation
A 46 year old man was found to have abnormal liver function tests. He had a history of high alcohol intake and intravenous drug abuse. His work up showed him to be infected with the hepatitis C virus, genotype 3a. Human immunodeficiency virus testing was negative. There was no other past medical history. The patient abstained from alcohol and was commenced on interferon (Viraferon) and ribavirin. In the final month of treatment the patient complained of blurred vision in the right eye. Visual acuity was reduced in the right eye at 36/60, with normal acuity in the left eye. Blood pressure was 200/140. Fundoscopic image is shown (fig 1).
Figure 1 Fundoscopic image of the eye.
Question
What is the cause of the patient's visual disturbance?
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