Contact Lenses – A Primer

contact Lense

Contact Lenses, or simply contact lenses, are tiny lenses placed directly upon the cornea of the eyes. Contact lenses have been used for more than a century to correct eyesight, and they are still used today primarily as corrective eye wear. Currently, there are more than 150 million individuals around the world who wear contact lenses, and they are used to correct vision either for therapeutic or cosmetic reasons. Some people even wear contact lenses in an attempt to alter their appearance.

Contact Lense

Contact Lenses are also commonly worn for astigmatism, myopia (nearsightedness), and farsightedness, which are short-sightedness. Contact lenses can be custom fit to the shape and size of the individual’s eye, and most are available with a selection of colors from which to choose. They are typically worn as an alternative to eyeglasses.

Soft contact lenses are more convenient than hard lenses, because they do not require a syringe to insert or remove. However, some people may experience dry eye, especially if they are wearing a soft lens for an extended period of time. Hard lenses require a lubricant to be added to the lens case, which then makes it possible to extract the lens when needed. In addition, some individuals are sensitive to the ingredients in certain types of soft lenses, while others find that soft lenses provide better comfort.


It is important to note that there are differences between extended wear contact lenses and standard disposable contact lenses. Standard disposable contact lenses are designed to be discarded after 30 days of use. Extended wear contact lenses are designed to be worn for an additional period of time, usually from six months to two years. The additional time frame helps to reduce the risk of dry eye, while also reducing the risk of damaging the cornea with excessive wear. Additionally, extended wear contact lenses are more comfortable than standard disposables, which may result in more frequent contact with the eye doctor.

The type of contact lens that is prescribed will depend on a variety of factors. Age, for example, will play a large role in the prescribed contact lens. Contact lenses that are prescribed for daily wear are often required to be replaced on a daily basis, while the longer-term prescribed lenses may be recommended to be worn for longer periods of time. Eye health, as well as a patient’s preferences, will also play a large part in the type of lenses that are prescribed. Some patients may need to wear vision corrective aids such as reading glasses or contact lenses on a daily basis, while others may only need to wear them on a weekly or monthly basis.


Currently, rigid gas permeable and soft lenses are the most popular types of corrective lenses that are prescribed. Both provide a high level of correction, with very little distortion of the eye’s cornea. As well, these two types of lens allow the eye to stay in a stable frame position, which helps prevent the development of myopia, hyperopia, and astigmatism. For these reasons, a significant number of people wear eye glasses, but there are also those who prefer contact lenses.

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