Actually, I think we can combine all of the arguments and come up with something a damn site more diver-friendly than handsets or LEDS and which satisfies all schools of thought.
What we really need is ALL the relevant info in one place, as redundant as you like, which involves NO effort on the part of the diver to monitor.
I suggest that rather than flashing lights, the entire handset functionality is shown on a small mobile phone-type screen mounted on the mouthpiece. This will show PO2, warnings and all the other good things we want to see.
Focusing problems? If these cannot be sorted out using lenses/prisms etc, then technology exists to "paint" the image directly onto the retina.
I'm no engineer and can only make suggestions. But I know what seems to be a definitive solution and that is what we as end-users should be asking for.
So Uri, up for a challenge?
