A 23-year-old man notes worsening vision in the left eye over one week. Visual acuity is 20/20 (6/6) right eye and 20/200 (6/60) left eye. There is a left relative afferent pupillary defect. The left optic disc is shown.

TYK 42719 FI


  1. Very interesting but if you could describe in your question that visual loss was painful or painless…it could help more.

    1. Right, it is not discussed in the question. Let’s discuss. How would that information affect your differential diagnosis?

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