optical center

optical center
noun
1. : a point on the axis of a lens that is so located that any ray of light passing through it in passing through the lens suffers no net deviation and that may be within, without, or in either surface of the lens
2. : the part of a flat surface (as a printed page or sheet) that appears to the eye to be in the center especially when not coincident with the geometric center

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Print.
a point about ten percent above the exact center of a printed page or layout.
Also called optic center.

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optical center,
a point in the axis of a lens so situated that all rays pass through the axis and the lens without being refracted.

Useful english dictionary. 2012.

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