Aplanatic


free from spherical aberration and coma.
historical examples

a lens in which the spherical aberration is corrected is said to be aplanatic.
an elementary text-book of the microscope john william griffith

aplanatic triplets 64-68 can only be used on stands with rack and pinion adjustment.
microscopes and accessory apparatus ernst leitz

adjective
(of a lens or mirror) free from spherical aberration

aplanatic ap·la·nat·ic (āp’lə-nāt’ĭk)
adj.
of or relating to an optical lens that is free from chromatic or spherical aberration.

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