定义：

一种成像时形成的对称弥散光斑的中心不在透镜光轴上的像差。当图像从场中心离开时，弥散光斑随之增大，慢慢形成彗差。也称为离轴球面像差。

English Expression：

abaxial spherical aberration

Definition:

A type of aberration in which a symmetrical light patch is formed at points that do not lie on the lens axis. When the image moves away from the center of the field, the patch increases in size, aiding in the formation of coma. Also known as abaxial spherical aberration.

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