This is a visual effect that off centers RGB making the image burly around the edges. It must be popular but it adversely effects some people giving them migraines, eye strain and eye muscle spasms.
|Notice the Left side of the screen and how blury it gets around the edges. This is Chromatic Abberation|
This is a huge deciding factor if I am going to buy this game now. I can't play games with this effect on, it hurts my eyes. If you put in options for colour blind people then I beg that you add a option to disable this effect.
Forcing this option on is discriminating against those with this condition.