Convert from gnat's eye to dong [Vietnam]

Unit Definition (gnat's eye)
The gnat's eye is an idiomatic "unit" of distance; it's common to hear that something is "as small as a gnat's eye". In fact, the eyes of typical gnats tend to have diameters similar in size to a hair's breadth: roughly 100-150 micrometers (0.10-0.15 millimeters).

Unit Definition (dong [Vietnam])
The đồng (VND) is the standard unit of currency used in Vietnam. It has a symbol ₫. It is subdivided into 10 hào, which are divided into 10 xu. The hào and xu units of currency are so worthless that they are no longer issued.