Since multifocal lenses are designed for those with presbyopia, a condition common with aging that causes the inability to focus on objects close by, they are a popular alternative to bifocal glasses.
Since bifocal lenses often cost a bit more than single vision ones, bifocals that stick onto regular lenses are a good alternative for those who can't afford to spring for the pricier pair of lenses.
There's no line that immediately jumps from distance vision to near vision, and if you aren't used to traditional bifocal styles, you may find it easier to adapt to the no line bifocal reading glasses than you would to the ones with lines.
Cibavision provides daily disposable contacts, weekly disposable contacts, monthly disposable contacts, contacts designed for astigmatism, cosmetic contacts, bifocal contact lenses, and specialty lenses.
When you're driving on your own, you don't have a navigator in the next seat over; bifocal sunglasses come in handy because you can read a map and drive without having to switch out your eyewear.
In general, opticians seem to be recommending no-line bifocals to those who are just now branching out into bifocal territory, whether they need them in the form of clear lenses or sunglasses.
If you're going to be reading outside but need your distance prescription for those moments when you gaze up from your book, magazine, or map, these, like other bifocal sunglasses, are possibly the perfect option.
The only problem with bifocal lenses was that objects neither far or near were still difficult to focus on, and bifocal eyeglasses also had an unsightly line halfway down the lens that was easy for people to see.
The computer glasses found at this site also have the bifocal setup with the reading prescription in the bottom of the lenses and the intermediate prescription derived from the stronger one located at the top.
As a rule every submarine has at least two periscopes, one unifocal with a small upper tube and the other bifocal and sky-searching with a larger upper tube.