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.
1 Cortical: A cortical cataract forms in the cortex of the lens, beginning with whitish streaks that extend to the front of the lens. These cataracts are commonly seen in diabetic patients. 2  Subcapsular: These cataracts form in the back of the lens and usually affect one eye more than the other.