Or a progressive lens with a large middle section for computer work could be used.
Trifocals are becoming rarer as more people choose to wear progressive lenses.
The typical progressive lens is produced from a so-called semi-finished lens.
For those new to progressive lenses, an accommodation period is often required because the brain needs to learn to adapt to them.
Fitting has become more critical with the variable-focus or progressive lenses.
The idea of the progressive lens came to him as he tried on his father's bifocal lenses.
After patents and calculations, this type of progressive lens appeared to be possible, but had yet to be manufactured.
But it would take a full week to make progressive lens and and the eye glass frame selection was meager.
He peered at Laurie through his newly acquired, rimless progressive lenses.
Gradients should not be confused with bifocals and progressive lenses.