I've been on 40 mg/day of Pred for about a week and a half. I'm hesitant to call what happened a "hallucination" because that sounds...scary. But, last night for about 15 seconds my visual field filled with swirling points of light that left trails (much larger and more distinct than the little squigglies you see when you look up at a clear blue sky). I've heard prednisone can do some pretty weird stuff, so I'm wondering how concerned I should be. Currently waiting for a call back from the doctor, but wanted to see if anyone on here had similar experiences on prednisone. If so, did it continue or was it isolated? Did you keep taking prednisone or lower the dose?