Everything in this poem circles around one thing: a woman's eyes and the effect they have on the speaker. He starts out simply stunned, "dumbstruck," unable to say whether what he saw was madness or magic. That uncertainty sets the tone early. He can't explain her, only react to her.
The middle of the poem treats her eyes almost like living things. They blink, roll and flutter, and he imagines them speaking in their own "parlance," a language that belongs only to her. They seem to carry her joy and feeling, even smiling in her tone. There's a nice contradiction too: the eyes are "sinful," yet their glance is "innocent," a mix that makes them more tempting and harder to read.
The mood is dazzled and a little overwhelmed. By the end, the speaker admits the eyes have thrown him into "chaos," and the poem closes on a short, breathless exclamation: "Her eyes!" It reads like infatuation caught mid-gasp.