Myopia is said to be caused by an elongation of the eyeball. This means that the oblong (as opposed to normal spherical) shape of the myopic eye causes the cornea and lens to focus at a point in front of the retina.
1 Bonds pay interest every six months until they mature. When a bond matures, the owner is paid the face value of the bond. 2  Bonds can be held until maturity or sold before maturity.  More about Treasury bonds rates and terms in the Research Center.
You do, however, gain a slight advantage by receiving your coupons more than once a year. If the return on your $1,000 bond is 6.0 percent and your coupons are paid every six months, your $30 interest payments are in fact equivalent to a 3.0 percent interest rate every six months.