In both A Call to Arms and Crusade there are people on the Excalibur's bridge wearing aviator-style rimless glasses. In one episode (can't remember what it was called, I'm afraid) it was the two crewmen at the Sensor station. This made me think that the specs are actually some sort of heads-up or VR display - a bit like the display that Hitchock used to wear on seaQuest when manipulating the VR probe outside the boat. Anyone else have any thoughts, or remember any clues? Totally trivial, of course, but there you go
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