A sphero cylindrical lens is a lens that focuses light into a line, just like a spherical lens. One or more of the curved faces of a sphero cylindrical lens are parts of a cylinder that focus the image passing through them to a line parallel to the point of intersection of the lens surface tangent to the plane.

The sphero cylindrical lens compresses the image in the direction perpendicular to this line, without making any changes in the direction parallel to it in the tangent plane. Cylindrical lenses focus or expand light in only one axis.
sphero cylindrical lenses can be used to focus light into a thin line in optical metrology, laser scanning, spectroscopy, laser diode, acousto-optic, and light processor applications. They can also be used to expand the output of a laser diode into a symmetrical beam. In the telecom industry, cylindrical lenses are widely used in WSS, 40G/100G modules, and pump laser modules.
Compared to sphero cylindrical lenses and aspheric lenses, this lens has a better radius of curvature and can maintain good aberration correction to obtain the required performance. The application of an aspherical lens brings excellent sharpness and higher resolution, and the miniaturized design of the lens becomes possible.
Through the above introduction and analysis of the Product features of the sphero cylindrical lens, hope it helps you.