A cataract is a clouding of the lens in the eye that affects vision. Most cataracts are related to aging. Cataracts are very common in older people. By age 80, more than half of all Americans either have a cataract or have had cataract surgery. cataract is a clouding of the lens in the eye that affects vision. Most cataracts are related to aging. Cataracts are very common in older people. By age 80, more than half of all Americans either have a cataract or have had cataract surgery.
Commonly known as farting, passing wind, or having gas, flatulence is a medical term for releasing gas from the digestive system through the anus. It occurs when gas collects inside the digestive system, and is a normal process.
Definition of flat for Students. 1  1 : a level area of land : plain. 2  2 : a flat part or surface the flat of the hand. 3  3 : a note or tone that is a half step lower than the note named.  4 : a sign â­ meaning that the pitch of a musical note is to be lower by a half 1  step. 5 : a tire that has lost  air.