CA varies from game to game but often
looks like this. They don't nickname it "Chromatic Abhorration" for nothing. It's one of the most nonsensical, unrealistic, irritating and widely despised effects to have plagued games over the past few years. Same goes with "Film Grain" (an aberration of processed silver halide based photographic film). Why on earth would you be "seeing" that in real time anywhere, let alone trying to intentionally mimick it as an "enhancement" by trying to copy a non-existent 35mm film camera flicking past a series of 35mm negatives at 60fps that your in-game avatar inexplicably has for eyeball replacements? As cmdrdredd said, your "viewpoint" in rendered games is not created by any light capturing camera. Although your eyeball's capture light (and by extension your in-game avatar's if you were him), they don't suffer from the same blur / color separation problems as optical camera zoom lenses nor work anywhere near as badly as game developers believe in almost every one of their "enhancing" post-processing FX (CA, Depth of Field, Motion Blur, Film Grain, Vignetting, etc). Intentionally adding "defective optical camera imitation shaders" (which is exactly what a lot of this stuff is) to a camera-less rendered video game makes about as much sense as adding severe "sewer pipe" audio reverb to the soundscape when you're standing in an open field.
The only good thing about seeing "Chromatic Aberration" in your game menu is the "Disable" button sitting next to it...