You can see where this moth gets its vernacular name from in the two images directly below, where it looks like the moth is wearing a pair of glasses or spectacles on its head. Wingspan 28 to 32mm. Similar species The Spectacle (Abrostola tripartita).
The adult flies between May and September. Found in a wide range of habitats including hedgerows and gardens. Common and widespread. The larva feeds on Common Nettle.
Dark Spectacle (Abrostola triplasia) © Pete Hillman August 2017.