What are the symptoms and tests for AION?
Most patients with AION notice a sudden painless disturbance in their vision. Because of the decreased optic nerve function, however, the pupils may not react as well when light is directed into the affected eye. Swinging a flashlight between the two eyes will then show an “afferent pupillary defect.” Visual field testing can identify the area of optic nerve dysfunction. Blood pressure should be checked and if there are any unusual features other blood studies may be done. In elderly patients a blood test (sedimentation rate or c-reactive protein) can help assess the risk of giant cell arteritis.
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