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.
Red Ants. In the United States, there are many species of ants that are red in color. Many times people will call ants âred antsâ because they do not know the correct name. However, the ant that is most often called the âred antâ is the red imported fire ant. Sometimes it is called by its initialsâRIFA. In Spanish, they are known as hormiga colorada or hormiga fuego. However, in Portuguese, the red ants are called formiga lava-pÃ©, or wash foot ant, and formiga de fogo.