AQP4-Ab+/ON produced similar structural injury patterns as NMO-ON. The pRNFL, mRNFL and IPL in the two types of ON and the INL in NMO-ON suffered more damage than those in AQP4-Ab-/ON, which could be associated with strong aquaporin-4 expression. The thickness of the NI of the pRNFL could be a potential clue for predicting ON progression to definite NMO.
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