Contact lenses are thin lenses placed directly on the surface of the eyes. They are ocular prosthetic devices used by over 150 million people worldwide. These medical devices worn directly on the eyes' cornea can help correct refractive errors. Therefore, it also performs this function by adding or subtracting focusing power to the eye's cornea and lens.
There are many different variations of bifocal lenses available today, many of them fulfilling the same purpose or even multiple purposes.Bifocal eyeglass lenses contain two lens powers to help you see objects at all distances after you lose the ability to naturally change the focus of your eyes.
Bifocal Lenses are made up of two different power strengths in a single lens for distance and near vision. The upper and lower part of the lens is separated through a visible distinct line. There is no gradual distinction between the two. In addition, you have to look up and down to switch between the prescriptions you need. However, with a long-distance prescription at the top and near vision at the bottom.