A Black. Man, a Moor, John Hanson was the First Black President of the United States! 1781-1782 A.D. George Washington was not the first President of the United States. In fact, the first President of the United States was one John Hanson.
OD is an abbreviation for the Latin oculus dexter, meaning right eye. OS is an abbreviation for the Latin oculus sinister, meaning left eye. The first number after the determination of which eye is the sphere. A negative number indicates myopia. A positive number indicates hyperopia.
Within the medical field, the individual is a Doctor of Optometry.    Within the sciences, OD refers to optical density. This is the ability of a solution or object to â¦absorb light.    OD can also be slang for overdose (in reference to drugs, whether legal or prescribed).