This document discusses different types of best form lenses, which aim to minimize optical aberrations. It describes the history of efforts to improve lens design, dating back to Huygens' proposal in the 17th century. The ideal best form lens is described as being aberration-free, easy to manufacture, and inexpensive. Four main types are covered: aspheric lenses, deep meniscus lenses, lenticular lenses, and periscopic lenses. Aspheric lenses modify the lens curvature to reduce aberrations. Deep meniscus lenses have a base curve of 6.00 diopters or greater. Lenticular lenses have a smaller powered central area within a larger unpowered peripheral frame. Periscopic lenses have