portion

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por·tion

(pōr'shŭn),
Part or division.
Farlex Partner Medical Dictionary © Farlex 2012

por·tion

(pōr'shŭn)
Part or division.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

segment of a bifocal lens (seg) 

An area of a bifocal lens of a power different to that of the main portion. Syn. portion. There is the distance portion, which has the correction for distance vision, and the near or reading portion, which has the correction for near vision. See intermediate portion.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann