Originally Posted by
Darryl Meister
Much of the first section seems to come from AG Bennett's old article, "Variable and Progressive Power Lenses," originally published in Manufacturing Optics International in 1973. It was probably the most complete history of progressive lenses up to that point, although there were one or two minor discrepancies (in particular, regarding Gowlland). Maitenaz wrote a great article on the history of the development of Varilux lenses, "Four Steps that Led to Varilux," originally published in the American Journal of Optometry in 1974. Both of these articles are required reading for the serious progressive lens designer or optical history buff.
Best regards,
Darryl