I would suggest reducing the number of far-seeing eyes on the Blimps to one. Binocular vision is important close-up, but not terribly useful as the distance becomes large compared to the separation between the eyes. Furthermore, as a lighter-than-air race the Blimps have evolutionary pressure to get rid of any surplus mass.
If you want to go really alien, give them two far-seeing eyes but have one vestigial. It's reasonable that their water-dwelling ancestors would have eyes in pairs, and only after flight was acheived would they see pressure to drop one. In this situation they're unlikely (under Earth genetics anyhow) to end up with the one eye right on centerline. This would be analagous to true terrestrial snakes which have only a right lung -- the left lung is vestigial as it would not fit inside their thin bodies.
Finally, you could have the 1% of the population born with the "wrong" sided far-seeing eye assume some distince societal role (leaders, mystics, whatever).
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If you want to go really alien, give them two far-seeing eyes but have one vestigial. It's reasonable that their water-dwelling ancestors would have eyes in pairs, and only after flight was acheived would they see pressure to drop one. In this situation they're unlikely (under Earth genetics anyhow) to end up with the one eye right on centerline. This would be analagous to true terrestrial snakes which have only a right lung -- the left lung is vestigial as it would not fit inside their thin bodies.
Finally, you could have the 1% of the population born with the "wrong" sided far-seeing eye assume some distince societal role (leaders, mystics, whatever).