before one's very eyes
under one's very eyes

Before one's very eyes and ears, a girl became a woman.

It is sometimes possible to watch things shift - or at least blur - before one's very eyes.

This is how speculation is promoted to "fact" before one's very eyes.

In winter, the water seems to crystallize before one's very eyes before being carried away on the fierce wind.

The childhood joy of pulling tabs, and seeing pictures change before one's very eyes, adds a dimension of warmth and humor to Mr. Hirst's otherwise chilly conceptual work - even if the images being transformed are animals suspended in tanks of formaldehyde.