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A complete IIIrd causes:

 Ptosis – upper lid drops and covers eye

 Large pupil unreactive to light (contralateral pupil constricts normally)

 An eye (lift upper lid) that’s ‘Down & Out’.

A partial IIIrd spares parasympathetic fibres (these fibres run beneath the nerve ‐ separate blood supply). Pupil: normal. Ptosis: incomplete.