No, it isn't. We're talking the most paranoid time in Starfleet's history, and we're talking about a device (the VISOR) that has twice been used against the Federation ("The Mind's Eye" and Generations).em.. I've got to be honest none of those seem that interesting to me - the answer to how La Forge switched from the visor to optical implants is "he went for an operation".
In other words, why are you assuming that La Forge chose to get rid of the VISOR?
