The poem is a single, quiet picture: someone puts on a pair of glasses and sees a summer house. The title plays with the word "spectacles," tucking "spec" and "tacle" apart so that "Spec(tacle)s" hints at both the glasses and the idea of a spectacle, something worth looking at.
The first lines describe the lenses and frames with careful detail. The glass is "polished" and "clear," and the gold frames are held "primly" in place, as if the glasses were neat and a little formal. Then the view opens out. Through them you see the summer house and a dirt path that seems to "wander" from its door right to your feet.
The speaker's feeling is gentle and warm. Nothing dramatic happens, yet the path reaching toward you suggests an invitation, or perhaps a memory drawing close. The mood is calm, nostalgic and a little dreamlike, as if clear sight brings the place near enough to walk into.