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The patient's age is the biggest risk factor for occlusion, a blockage in a small blood vessel that carries blood away from the retina.
Dr Natasha Radhakrishnan is a Kochi-based senior retina consultant and the founder of the organisation Childhood Uveitis Blindness Support (CUBS).
Retinal vein occlusion, the common cause of blindness, occurs when a major vein that drains blood from the retina is blocked, usually due to a blood clot.
The medication toxicity could masquerade as other known retinal conditions, such as age-related macular degeneration or pattern dystrophy.
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