Bifocal lenses take some adjustment for many people, whether you start with bifocals or switch from regular lenses. New bifocal wearers might experience difficulty as they move from looking through the top to the bottom of the lenses. The bifocal line or the blurry lower portion of the lenses also cause visual distractions. Your eyes and your brain will eventually adapt to the visual changes that come with bifocals, but the process takes consistency.
Trifocals offer a top for distance, a middle section for the distance of a dashboard and a bottom portion for reading up close. The lines between each prescription may disrupt vision for some. If that's the case, no-line progre...
In 1959, the introduction of the progressive bifocal lens, also called the no-line bifocal lens, by Bernard Maitenaz gave the public the option of an alternative to the traditional lined bifocal. Although fitting progressive le...
Progressive lenses, also called no-line or invisible bifocals, are the most popular type of bifocal lenses, according to the June 2009 issue of "Eye Care Professional Magazine." Cosmetically, the lenses look nice, and progressi...
Almost everyone has to use optical aids like bifocals for reading by the age of 50. Presbyopia is the gradual loss of the eye's ability to adjust and focus when trying to read or see up close, according to the National Eye Inst...
The function of an eyeglass lens is to bend rays of light so that when they enter the eye they focus perfectly on the eye's retina. This idea of using lenses to improve faulty vision goes back many centuries. While the technolo...
Bifocals can also be made with Ben Franklin-style lenses, where the lenses are horizontally split down the middle, with the distance prescription in the top half and the reading prescription in the bottom half. All bifocal lens...
