Tabletop light filed display system based on views-segmented voxels can display high quality 3D images with frontal viewing area, 100° viewing angle and full parallax. However, the system also has the problem of nonuniform distribution of viewpoints. The central area of the viewing zone has dense distribution of viewpoints, and both marginal sides of the viewing zone has sparse distribution of viewpoints. Nonuniform distribution of viewpoints causes the incorrect perspective relations of the displayed 3D image and crosstalk between adjacent viewpoints. This paper performs analysis on the construction process of viewpoints and determines that the main reason for the nonuniform distribution of viewpoints is the aberration of the cylindrical lens used in the system which causes the emitted light rays not to converge at one point, but a diffuse spot. An aspheric lens is proposed and designed to optimize aberrations. Finally, the experiments are conducted to verify the correctness of the method. The uniformity of the viewpoints distribution is increased from 39.32% to 98.39%, and the problems of incorrect perspective and crosstalk between viewpoints are effectively improved.