You are really just talking about your preferences as if they are scientific absolutes. It depends on your eyes including the amount of floaters you have and ho

You are really just talking about your preferences as if they are scientific absolutes. It depends on your eyes including the amount of floaters you have and how imperfect the lens of your eye is away from its centre, the lighting conditions of your room, your monitor, your taste. I am not sure exactly when the recent trend towards dark editor themes started but I wonder if it was around the same time that WLED LCD backlighting took over? I love white themes on my CFL monitor but not so much on my WLED laptop. I also think maybe many people started preferring dark colour schemes because colours pop and look more saturated against black, and so it looks better in screenshots etc.