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.
Ants are social insects-they live in colonies that contain three castes or groups: workers, queens, and males. Most of the ants you find in a colony are the workers, which are sterile females. They are responsible for gathering food, feeding the brood and queen(s), and defending the nest.mmature ants or âbroodâ are usually a whitish color and somewhat resemble fly maggots. They are found inside the nest where they are tended by adult workers. Adult ants do not grow. Some ant species have may have individuals of different sizes.