Later they were described as obsolete and I did not see any modern versions to show up.
For bus driving I needed "bi-focal" lenses and the shark in the optician store sold me varifocals, cost a fortune. But when you have to read a vehicle instrument panel and distant road signs and everything in-between they are the right thing to have.
Couldn't one argue that the sheer omitting of that third group enhances image qualty, or would that be mere academic, without practical effect?
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