Equi-Angular Lens

From International Dictionary of Marine Aids to Navigation
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A prismatic lens obtained by the rotation of an equi-angular profile about the optical axis of the lens. In such a lens, the bullseye and rings usually present a continuous convex surface towards the source.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM