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A 71-year-old man says the vision in his right eye switched off ninety minutes ago, without pain. He can count fingers only on that side. The right pupil dilates when the torch is swung across to it. The right retina looks pale with a small red circle at its centre, and the arterioles are broken into segments. He takes no regular medicines. His pulse is 96 and irregularly irregular, and his blood pressure is 152/88 mmHg. Which one of the following should be arranged first?
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