Game Version number: 1.2.1.169, and 1.3.0.25 Experimental (suggestion applies to ANY version)
Modded?: No

Issue Description:
After a short duration of running on foot, a vignette effect is applied to the screen, making the picture towards the edges of the screen significantly blurry (see attached image).

This effect can be extremely annoying for some people.
It is in the same vein as Depth Of Field, or Motion Blur - all these effects are usually optional in nearly every game, and for a good reason.
It can trick the brain into 'thinking' the eyes are not focused correctly, resulting in perpetual attempts to re-adjust the focus, which is very tiring for the eyes, and evetually ends up causing a headache.
For that reason, this effect should be optional (same as Depth of Field which, fortunately, is already optional).

This effect doesn't affect game play in any meaningful way (even in PvP, being able to switch it off would not give you any advantage over other players).
So there is no reason for it to not be optional.