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.
The Treasury no longer issues E or H bonds. E bonds originally earned interest for 30 or 40 years, depending on the issue date. H bonds originally earned interest for either 29 years and 8 months or 30 years, according to the issue date. They have all reached final maturity and stopped earning interest. If you hold these bonds, you should cash them in.