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位于平行光路中的光楔产生畸变像差，它产生的畸变是光楔顶角α、光轴入射角Ｉ和视场大小的函数。为分析讨论清楚这些问题，文中建议光楔畸变用两个正交分量Ｄｘ和Ｄｙ表示，并给出大光轴入射角光楔畸变显式计算公式和关于视场的３阶近似计算公式，以及正方形物体经光楔成像后各边的斜率解析式。分析和计算都表明，正方形物体经光楔所成的像是凸侧面的钟形而不是凹侧面的钟形。
The optical wedge located in the parallel optical path generates distortion aberration. The distortion it produces is a function of the wedge angle a, the incident angle I of the optical axis and the size of the field of view. For the purpose of analyzing and discussing these problems, it is suggested that the optical wedge aberration be represented by two orthogonal components Dx and Dy, and the formula of optical wedge aberration at large optical axis and the third-order approximation formula of field of view are given. The slope of each side of square object after wedge imaging. Both analysis and calculation show that square objects are formed by wedges like bell-shaped rather than concave-sided bells.