 In both "Sonnet 46" and "Sonnet 47" the "eye", as a party to the trial or to the truce is always used in the singular.The plural "eyes" is used in line 6 of "Sonnet 46" and possibly (at least in the modern version of the text) in line 14 of "Sonnet 47" but they do not refer there to the "defendant".In "Sonnet 24" both singular and plural are used to refer to the eyes of the speaker.