What does “before front of eyes” mean?

in sb's presence; in front of sb

How is “before front of eyes” used?

In What's Eating Gilbert Grape (1993), one line is: “It'll just change really, really slowly in front of your eyes.”

The clip at the top of this page is from What's Eating Gilbert Grape (1993).

It'll just change really, really slowly in front of your eyes.

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