Near the end of the episode A Matter of Time, we see a tray of items including Geordi's VISOR. However, Geordi spends half the episode on the surface of the planet and is clearly still wearing his VISOR at the time.
Was this a production oversight or does Geordi have more than one VISOR? I don't see why he would need more than one, unless he keeps older models around (the flashback in TNG: Identity Crisis showed that he has had multiple versions over the years).