Wow, can't believe all the pilots that use tri-focals. I tried 'em
once and threw them away as far as they would go. I've been wearing
progressives for several years now and will never go to a discrete
lens. When I first started using them it took a few days for the brain
to adapt to the distorsion but after that I've never noticed it. But
you have to have good progressives; I forget which brand mine are but
brand makes a huge difference.
--
In all affairs, it's a healthy thing now and then to hang a question
mark on the things you have long taken for granted.
~ Bertrand Russell