There are times when you should request copies of your records: 1  Permanent Change of Station. 2  Deploying. 3  Retiring.
0. EXPERT ANSWER. Double coincidence of wants refers to a situation in a barter system where the goods or services offered by a seller are exactly the same as that required by a buyer and vice versa.
Convergence Insufficiency or Excess. When an object is getting closer to you, your eyes have to converge to see it. Converge means to move the eyes in towards each other. Double vision is a common side effect of poor convergence ability. Convergence is the ability for the eyes to turn inward towards each other.