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.
doctors refer to nuclear cortical and posterior subcapsular cataracts depending on the layer of the lens involved in many cases cataracts are age related appearing first when a person is in his or her 40s or 50s but not affecting vision until after age 60 in other cases cataracts may be related to eye trauma long term diabetes corticosteroid medications or radiation treatments