A Brief Guide To Bifocal Contact LensesThere was a time when people used to wear glasses all the time to cure defects in eyesight- think of a world where a single refractive error meant that you would have to wear those bulky glasses over you eyes. Then came the contact lenses and everything changed, everything changed for the good. People were finally free from the bindings of those bulky eyeglasses. No matter how big the refractive error was, people can still wear contact lenses to correct those errors, and the best part is no one can notice that they are actually wearing the lenses. If you thought contact lens is a recent phenomenon, you will be surprised to know that this concept is over a century old. However, giant strides in medical, ceramic and manufacturing technologies have completely altered the way contact lens is manufactured and used. A contact lens is a device that is worn on the eyes and is implanted on the cornea to correct defects in eyesight. Contact lenses are small and easier to use and provide the wearer with a tremendous amount of freedom, that is exactly why they are so popular among the sport enthusiasts and people who are constantly on the move. There are various types of contact lenses, and the broad categorization is done depending on the functions they perform and the materials that are used to make them. The basic use of these contact lenses is to provide refractive correction and such lenses are called corrective lenses. Corrective contact lenses: These lenses are designed to vision suffering from refractive errors. These corrective contact lenses neutralize or nullify the refractive error that the user may have. These lenses correct farsightedness, shortsightedness, and even astigmatism. Corrective contact lenses can be of two types- hard contact lens and the soft contact lens. There have been a lot of complaints about infections that have been caused by the hard contact lenses. So nowadays people prefer the soft contact lenses over the harder ones. Such types of contact lenses are called the bifocal lenses which are used to correct both nearsightedness and farsightedness. Multifocal contact lenses are very complex to manufacture and require a tremendous amount of skill to fit properly. Most of the soft bifocal contact lenses are considered to have a simultaneous vision because of the fact that both farsightedness and nearsightedness can be corrected with the help of these lenses. Usually these contact lenses are designed with near correction at the periphery and distance correction at the center of the eye. Bifocal contact lenses need a lot of care and maintenance, and are to be handled very carefully. Every night before going to sleep the user must wash the lens in a cleansing solution that cleans the lens from any bacterial or fungi that may be present on the surface. Bifocal lenses have definitely made things easier for patients with eye problems to lead a normal and active life and finally say good bye to those bulky frames and chunky glasses that would have adorned their faces had they been born a few years ago. |