What is bifocal lenses works?

Depending upon the occupational needs, a type of bifocal is selected.

A salesman, who has mostly outdoor work and very little reading to do, would have a small round-top bifocal fitted.

An office worker, who has to deal with close work but still has a fair deal of distance activity would use a regular medium-size round-top bifocal segment.

An executive who deals mainly with paper work or an accountant who has masses of figures to pore over would require either a very wide round-top bifocal or preferaly the straight-line executive bifocal. However, do remember that though the straight-line executive lenses are excellent for desk work they cause problems when one has to walk with them, as the complete lower field is affected. I deally, they should be left on the desk after finishing work and a small D or Flat-top bifocal used for activities outside.

So if you think you need it, why not choose it now?