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.
The ghost ant (Tapinoma melanocephalum) gets its name from its size and pale color of its legs and abdomen, which make it difficult to see. These ants have dark heads and thoraxes.The workers are about 1.3 to 1.5 mm long. Ghost ants are related to odorous house ants.he workers also gather insects to feed the colony. When they are indoors, ghost ants usually prefer sweets. Outdoors, ghost ants make their nest in the ground. They often nest beside stones, logs and firewood piles.