Geordi La Forge's visor can be used to see different electromagnetic fields. This lets him see people as glowing fields, as well as other fields. How can he see monitors and other interfaces? A screen would have to have variance in its field in order to differentiate the separate icons so that his visor could pick it up but they don't do this (or at least real screens don't). Is there any in-universe explanation?
Geordi's visor detects electromagnetic emissions - visible light is a part of the electromagnetic spectrum. It's just that the visor picks up a wider range of frequencies than natural human eyes can.
He'll still be able to distinguish icons, text and graphics on a screen that is active, just like we can.