| aplanatic | <microscopy> Corrected for spherical aberration and coma. (05 Aug 1998) |
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| aplanatic lens | A lens designed to correct spherical aberration and coma (q.v.). Synonym: periscopic meniscus. (05 Mar 2000) |
| aplanatic points | <microscopy> The two conjugate points for which a completely spherical glass lens is aplanatic. They lie on the principal axis, both within the sphere. (05 Aug 1998) |
| achromatic aplanatic condenser | <microscopy> A well-corrected microscope condenser lens, corrected for chromatic and spherical aberrations and satisfying the sine condition. (05 Aug 1998) |
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