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.
Series I bonds bought from November 1, 2016 through April 30, 2017 will earn 2.76% interest during this six-month period. The rate for Series I bonds issued during this period is a combination of a fixed rate (fixed for the life of the bond) plus an adjustable rate (adjusted every six months) based on inflation.