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.
They are called Odorous House Ants, because when you smash them they smell bad, like urine or rotting coconut. Some people even refer to them as 'piss ants'. However, many types of ants smell bad when you smash them. They are also known as Sugar Ants, they get that name because they readily feed on sugar, pop, syrup, and other sweets. In nature these ants actually eat other insects and insect secretions. Aphids make a sticky 'sap' when they eat the leaves of bushes and trees. This 'sap' is an insect super food, highly valued by ants and wasps-it is almost pure sugar. Left: Odorous House Ant workers (sugar ants) around the edge of a spoon.