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What Are Bifocal Contact Lenses And How Do They Work? |
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The condition that necessitates the use of bifocal contact lenses or glasses is known as presobyopia. Basically presbyopia means that there is an inability to focus on articles that are both near or far. Presbyopia results from the hardening of the eye's lens which will gradually deteriorate with time. As this condition is age related it means that majority of the population will have to resort to wearing either contact lenses, glasses or bifocals as they advance in years. Bifocals used to be very unattractive and there was little choice of style or lens available in past years. For those who required bifocal lenses only glasses were available. However, as technology progressed bifocal glasses became somewhat more aesthetically pleasing, and the line in bifocal glasses that separated the two corrective lenses disappeared. This period of development for this type of corrective lenses was much welcomed and bifocals became a much more appealing necessity for some. Today, advances in the field of corrective lenses has developed to such an extent that bifocal contact lenses are actually available. This is indeed good news to those who were previously forced to resort to cumbersome and unattractive bifocal glasses to assist their vision problems. As the popularity of contact lenses increases the bifocal contact lenses option is highly desirable. The principles of design between bifocal contact lenses and glass lenses share a relationship in the way that they function. For example, the two strengths of lenses that are contained in glass bifocals offer assistance in focussing on items that are either near or far, each working separately from the other. Contact lenses that are designed for bifocal usage work in the same way yet both types of lenses are integrated, rather than being distinctly separate. It is always recommended that some time and effort is put into your choice of bifocal contact lenses as there are many brands and types available, and making the correct choice for your specific needs is naturally important. Amongst the various types of bifocal contact lenses you may come accross and type of lens which is referred to as concentric because their design include two distinctive cirlces of lens strength, one central and one peripheral, both having a definite line between them. They are, contrary to their discription, quite uncomplicated and with patience most people adjust to them fairly quickly. The aspheric lens is designed to give similar results as the concentric lens, but has a less distinct adjustment which means focussing will be more gradual. Both lenses are set in the middle area of the pupil which means, like concentric lenses, your eye will react accordingly to the type of focus that is required. A type of bifocal contact lens that is most suitable for the aged is known as the translating lens. These contact lenses work in exactly the same way as bifocal glasses in as much as the lens used to focus on distance is placed at the top and on the bottom part is the lens used to focus on items that are near. Their advantage is that that remain stable in the eye regardless of movement regarless of what activity is undertaken. It goes without saying that it is always necessary to seek the advice of a professional before choosing bifocal or multifocal contact lenses for yourself. Your eye specialist or optician will make an examination to decide if you require bifocal contact lenses and will then be able to prescribe the right correction lenses for your type of visual impairment. For those who already are used to wearing bifocal glasses, bifocal contact lenses may come as a welcome alternative. Just like other contact lenses, bifocal lenses are offered in a variety of choices which include lenses for singular use and are disposable, those which can be worn during sleep and for longer periods of time and those that require the normal care regime. |
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