Acylinders - aspherical cylinder, denotes cylindrical-surface-shaped lenses, the cross-section of which differs from the circular shape. In practice, plano-concave and plano-convex cylinders are used as well as those with a spherical or aspherical reverse. In contrast to a lens, an aspheric cylindrical lens does not concentrate incident light into one focal point, but along a focal line without the influence of spherical aberrations. Advantages include; minimization of aberrations, efficiency increase, reduction of the total number of optical components within optical systems. Cylindrical Lenses are often used in pairs for beam shaping in a variety of applications.
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