Anyone design a 'ben franklin' lately?

[Wes]

Ask Chip. He'll get back to you in another 10 years!

[chip anderson]

Franklin made of four separate lenses (allowing for high disparity in power and prism between distance and Near). Executive is single lens with edge to edge line. Doesn't anyone read the history of thier chosen profession?

Chip

[uncut]

We have a history?

[tdj]

Franklin made of four separate lenses (allowing for high disparity in power and prism between distance and Near). Executive is single lens with edge to edge line. Doesn't anyone read the history of thier chosen profession?

Chip

Yes, actually, we do. Those who do write the histories don't seem to find it an important enough topic -- not even Brooks discusses the difference, as far as I remember. Why don't you write a book, Chip?

[Ory]

Franklin made of four separate lenses (allowing for high disparity in power and prism between distance and Near). Executive is single lens with edge to edge line. Doesn't anyone read the history of thier chosen profession?

Chip

By 4 separate lenses you mean 2 per eye, right?

[chip anderson]

Right!

[Jacqui]

The most common use here is to solve a convergence problem at the read. They can be used for other reasons when a molded blank is not available, such as using base up prism on the distance only to help with a posture problem. I was doing 12 - 15 pairs of them per week. Seems as though when the Dr's found out what could be done they found them very useful. Once you get used to working with multi-piece lenses there is a lot you can do with them. The technology is about 250 years old, but still useful.