How should du regard be understood with the verb parcourait?

I’m not quite understanding the meaning of du regard in the following sentence:

L’évêque parcourait la salle du regard et semblait y faire avec les
yeux des mesures et des calculs.

It seems to mean something like:

He roamed through the room with his eyes…

But that doesn’t fit with how I would normally expect du regard to be translated. (I would expect: of the look).

My question:

Is this a special usage of the phrase du regard? What is the correct meaning of it?

Thanks!