I recieved my lovely rmbp yesterday (macbook virgin). After using it for about 10 minutes I noticed that I couldn't focus on the text properly and my head started to feel really tight and felt buzzing (tinnitus) in my ears. This followed by severe eyestrain, dizziness and nausea. I have never experienced this before, I own a vaio (3 years old) and an ipad 3 with retina amongst other gadgets. I thought I may be just over tired and excited so went and had a rest for a couple of hours. When I came back to the macbook all the symptoms started again. I have tried different settings (brightness, resolution, etc). I let someone else use it and they never had any of the problems i did, so it's definitely me :-(. I recently had my eyes tested and have 20-20 vision. This has really pi**ed me off as I love the macbook and the crispness of the screen. Can anyone help or give me some advice as I don't want to return it? Thankyou for taking the time to read this.