It is an information to state that any action,process or function has begun.It is the US abbreviation for the name of the Canadian Province of Ontario.It is a preposition mean â¦ ing that one object is in contact with, and usually above, another object.
Sparing the nucleus: Cortical cataracts are in a layer of the lens outside of the nucleus which is the center of the lens. They are sometimes congenital. Depending upon the density they may disturb the vision but sometimes are thin enough not to be a problem.
Age-related cataracts are divided into three types, depending on their location. Nuclear cataracts form in the middle of the lens and cause the nucleus, in the center, to become yellow or brown. Cortical cataracts are wedge-shaped and form around the edges of the nucleus.