Plano-convex Spherical Lenses have a constant curvature from the center to the edge of the lens, while aspheric lenses have a continuous change in curvature from the center to the edge.

In photographic lenses, numerous "aberrations" must be corrected in order to maintain optical performance. If only Plano-convex Spherical Lenses are used for correction, many lens combinations are required to correspond to the technical requirements of the lens. For special advanced lenses, spherical lenses alone sometimes cannot correct aberrations to the user's satisfaction.
Technical principles. Compared with Plano-convex Spherical Lenses, and aspheric lenses, the radius of curvature varies with the central axis, to improve optical quality, reduce optical components, and reduce design costs. Compared with spherical lenses, aspheric lenses have unique advantages, so they have been widely used in optical instruments, images, and optoelectronics industries, such as digital cameras, CD players, and high-end microscopy instruments.
Through the above introduction and analysis of the Plano-convex Spherical Lenses, hope it helps you.