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Compound eyes fall into two groups: apposition eyes, which form multiple inverted images, and superposition eyes, which form a single erect image
RemipediaRemipedes lack any kind of eyes since their habitat is absolutely aphotic, and chemical (and tactile) clues most likely play a major role in orientation ... An outstanding feature of the anterior brain of G. frondosus is the inverted neuraxis, caused by the striking elevation of the proto- and deutocerebrum, which are additionally bent almost 180į backward so that the neuraxis is inverted with respect to the body axis. In consequence, the protocerebrum is oriented upside down and located posteriorly to the deutocerebrum, which points upward and backward with the olfactory neuropils sticking out anteriorly.
Peppercorn - it's true even in flies, let alone higher organisms!
If crossover is to correct reversed images then the extra half twist in the neurology is not necessary for the sightless.