What does OA mean?

Optic Axis (OA) refers to the axis of symmetry of an optical system, such as a lens or a crystal, where light passes through and maintains its direction.
OA is defined as an imaginary line that runs through the center of a lens or other optical element, perpendicular to the surfaces of the lens. It is used to describe the optical properties of the lens and the behavior of light passing through it.

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