From the script of Season 1: Episode 20, "Heart of Glory," as posted on st-minutiae.com; while Geordi is transmitting the VISOR data stream back to the Enterprise bridge via the visual acuity transmitter (emphasis added):
Picard: Geordi. What was that? Over to the left.
Picard: That—right there? No—back. Yes. That—right there. What is it?
Geordi: It's Commander Riker.
Picard: To me it's just an undefined upright form, standing in a wild visual frenzy. Can you filter out the extraneous information?
Geordi: No, I get it all simultaneously.
Picard: It's a jumble. How can you make heads or tails of it?
Geordi: I select what I want to see and disregard the rest.
Picard: How is that possible?
Geordi: How, in a noisy room, can you pick out one specific voice or sound?
Picard: It's something you learn.
Geordi: Exactly, It's something I have learned.
Thus, I would argue that Geordi cannot restrict the bandwidth of the data stream the VISOR passes to his visual cortex, at least not the VISOR of the ST:TNG show itself.