For most of us, presbyopia is something we have to live with. In definition, presbyopia is the lack of focus on things at close range. The cause of this is that the lens of our eyes becomes less and less flexible as we age. The bad part is that most of us will need some type of corrective lenses, such as contact lenses or glasses and perhaps even bifocals at some point in our lives as this condition worsens. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an Original Essay Until recently, bifocal wearers had very limited options when choosing corrective lenses. Years ago, glasses with bifocal lenses were virtually the only option available. Over the years, lineless lenses were created and glasses became a little more attractive. It was truly a definitive time for bifocal corrective lenses, as they looked much better than they had in the past, eliminating the bulky and unattractive appearance that they were well known for. Nowadays, you can find many different types of bifocal contact lenses on the market. They are gaining popularity, as they offer bifocal wearers a very attractive alternative to bulky glasses. They are also very affordable, making them a more popular choice in the world of corrective lenses. What many may not realize is the fact that bifocal contact lenses are very similar to glass lenses in the way they work. With glass lenses, each separate lens provides a range of focus adjustments, one for distance and another for getting closer to something. With bifocal contact lenses, both adjustments are included. There are several manufacturers that make different types of bifocal contact lenses, which means it may take a little research and experimentation to find which type works best for you. Some lenses, however, are made with a unique design, known as concentric. Similar to concentric circles, there are two adjustments: one in the center and one around the outside. These two adjustments in the contact lens are very distinct, with a clear line between them. While they may seem difficult to use, most people find they are easy to use with a little practice. One type of bifocal lens is the aspheric lens, which has a more gradual change in focus. Both powers are located in the central area of ​​the pupil, and similar to the concentric lens, your eye will immediately adapt to these lenses and decide the best focus to use. The third and perhaps best lens for bifocal use is the translating lens. Just like bifocal glass lenses, the near correction is located at the bottom of the lens, while the distance correction is located at the top. These lenses are unable to move when they are in the eye, as they are normally made so that they cannot move. This can be great for older people, as these contacts don't budge no matter what you do. Please note: this is just an example. Get a custom paper from our expert writers now. Get a Custom Essay When it comes to bifocal contact lenses, you should always ask your optician what he thinks is best for your eyes. If you meet the right criteria, you will likely be prescribed bifocal contact lenses. If you wear bifocal glasses, you may find these contact lenses to be the perfect alternative. You can get extended wear, daily disposable, or even conventional bifocals, which is great for those who like a lot of choice. With a lot to.