The phrase "focus effect" refers to the idea that concentrating on something specific can cause improvements or changes in that particular area. Full definition
This loose powder creates flawless but a soft focus effect. (smashinbeauty.com)
But because pharmaceutical drugs almost always act by a singular and focused effect on the body, no such drug exists. (animalkindvet.com)
The device includes new camera features, including Live Focus, which uses the individual lenses to create a depth of focus effect in images. (ibtimes.com)