Vingette: vin-yet - Vingetting photographs can sometimes enhance a photographs feel and composition.
Our eyes tend to look at the brightest parts of an image, so when you vignette, it forces the eye away from the
corners and sides and moves the gaze towards the center.

In Photoshop> Filter > Distort> Lens Correction
In Photoshop> Filter > Distort> Lens Correction

Adjust the Amount and Midpoint to vary the effect.