The BVD stands for Back Vertex Distance, this is a measurement that is included on any prescription where the sphere or cylinder powers are higher than + or - 5.00D and to a lesser extent some prescriptions where it is less than this power.
Winged Drone | Alate | Male Ant. Drones are the only male ants in a colony. They are born from un-fertilized eggs. Drones are not like typical ants. They donât do any work in their nests, and they look more like wasps than ants. They are reproductive winged ants and so are alates.
Carpenter ants (Camponotus spp.), also known as sugar ants, are large (0.3 to 1.0 in or 0.76 to 2.54 cm) ants indigenous to many forested parts of the world.They build nests inside wood consisting of galleries chewed out with their mandibles, preferably in dead, damp wood.They do not consume the wood, however, unlike termites. Sometimes, carpenter ants hollow out sections of trees.They also commonly infest wooden buildings and structures, and are a widespread nuisance and major cause of structural damage.hey do not consume the wood, however, unlike termites. Sometimes, carpenter ants hollow out sections of trees. They also commonly infest wooden buildings and structures, and are a widespread nuisance and major cause of structural damage.