curvature of field
Also found in: Medical.
curvature of field(field curvature) A minor aberration of a lens or mirror whereby an object lying in a plane perpendicular to the optical axis produces an image lying not on a plane but on a curved surface. If there is any astigmatism present there will be two curved focal surfaces.
curvature of field[′kər·və·chər əv ′fēld]
Error in the image of a plane object formed on a flat screen by an optical system when the best image lies on a curved surface. Also known as field curvature.