Chromatic Aberration
Chromatic Aberration is an age-old visual artifact associated with cheaper camera lenses and improperly taken photos. In recent years however, Chromatic Aberration has grown popular with game developers, much to the dismay of gamers who prefer cleaner images free of unsightly distortion. In the context of a photographer, or a security guard viewing the game world through a cheap camera, its use might make sense, but when playing in first or third person it merely suggests a trip to the optician is in order.
Thankfully, CD Projekt RED has made Chromatic Aberration an optional effect in The Witcher 3: Wild Hunt, ensuring a clean, clear image is obtainable. When enabled, it distorts the picture slightly, but no where near the extent seen in other games featuring the effect. This doesn't really come through on screenshots, however.