English Noun best form lens (plural best form lenses) (optics) A lens that is designed to minimize spherical aberration. 2003, R. Pitts Crick, A Textbook of Clinical Ophthalmology:The lens form having the least optical aberrations is called the best form lens. For most powers of spectacle lenses the best for is a meniscus lens.Wikiwand - on Seamless Wikipedia browsing. On steroids.