There is a blaze in the eyes, and the nose is emitting smoke due to a fierce, burning fever.

This powerful couplet paints a vivid picture of someone experiencing an extremely high fever. It compares their intense state to flashing lightning. Imagine their eyes burning with a fiery glow, as if flames are dancing within them. Their nose, too, seems to be emitting smoke, a dramatic exaggeration to convey the incredible heat radiating from their body. It's a striking way to describe the overwhelming and almost supernatural intensity of a very severe fever, making the person appear consumed by it.