paraxial region

paraxial region 

The hypothetical cylindrical narrow space surrounding the optical axis within which rays of light are still considered paraxial. Syn. gaussian space. See paraxial ray; gaussian theory.
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However, their descriptive capability is still restricted to the paraxial region.
They arise in the ovary but can be located at the midline and in paraxial regions of the body and unusual locations, including lungs or ilea, were described [2].