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This article, titled "Optic neuritis as an immune-related adverse event of pembrolizumab," discusses a case of a 78-year-old man who developed cloudy vision after receiving pembrolizumab treatment for metastatic small cell lung cancer. The patient exhibited optic disc swelling, peripheral field loss, and hemianopia in the left eye. The diagnosis was pembrolizumab-induced optic neuritis, and treatment with steroids resulted in some improvement in vision. The article highlights the challenges in detecting optic nerve contrast enhancement on MRI but emphasizes the importance of recognizing optic disc swelling as an indicator of inflammation. The authors declare no conflicts of interest. [Extracted from the article]