The phrase "a visible effect" is correct and usable in written English.
You can use it when describing an outcome or result that can be seen or observed.
Example: "The new policy had a visible effect on employee morale, leading to increased productivity."
Alternatives: "an observable impact" or "a noticeable result."
The draining of the credit pool is already having a visible effect.
Action operations, on the other hand, always produce a visible effect.
Such rhetoric is having a visible effect, in the form of nasty anti-immigrant protests.
If I Could Write Poetry and Stop and Smell the Roses are moments of genuine beauty, and the latter has a visible effect on Treacy.
It perhaps just has less of a visible effect in areas where there is higher poverty, conflict or worse health provision generally.
I have found very little evidence that vast amounts of innovation in financial markets in recent years has had a visible effect on the productivity of the economy...
From a safe distance, we could hear the detonation but could not see any visible effect.
They produce scooped-out swaths of earth, making them a particularly visible effect of climate change.
Officers breached the door and fired Tasers and a rubber bullet at Mr. Bah, without "visible effect," a Police Department spokesman said a day after the episode.
"From a statistical point of view, cutting down on foreign students has a more immediate and visible effect, as opposed to family migration, for instance," said Serge Slama, an assistant professor at the University of Evry-Val d'Essonne, south of Paris.
He goes so far as to call this realization "Snowden's 'gift,' " referring to him as the "visible effect" of a "broad cultural shift that is redefining legitimate secrecy, necessary transparency, and what constitutes the consent of the governed".
