Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
D-Six3NM_0799567227opt    Six3    Dsix3    optix    CG18455   
D-Six3NM_1655847227opt    Six3    Dsix3    optix    CG18455   
D-Six3NT_0337787227opt    Six3    Dsix3    optix    CG18455   

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* OMIM link based on symbol match for human and mouse.

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Text2Knowledge ... Yong Huang 2002