spheric aberration

spher·i·c ab·er·ra·tion

a monochromatic aberration occurring in refraction at a spheric surface in which the paraxial and peripheral rays focus along the axis at different points. Synonym(s): dioptric aberration

spher·i·c ab·er·ra·tion

(sfēr'ik ab'ĕr-ā'shŭn) A monochromatic aberration occurring in refraction at a spheric surface in which the paraxial and peripheral rays focus along the axis at different points.
Synonym(s): dioptric aberration.