I know there are other monitor threads out there, but I want to ask specifically for my needs. I'm a programmer and I often spend 10-12 hours a day looking at code. I have a mid 2012 Retina MB Pro with NVIDIA GeForce GT 650M 1024 MB. I want the best external monitor possible for the main purpose of being easy on my eyes. I currently use a Dell U2412M but I feel like I could do better. I've read about the new 28-inch 4K dell coming out, but people complain about the 30 Hz refresh rate. Does that matter for me? I don't care about gaming. Like I said I just need something that won't hurt my eyes after staring at it for 50+ hours a week. Obviously the higher the resolution the better. I am willing to pay for something good. Maybe not $3500 but any reasonable cost.