Though spectacles remain the primary means of correcting vision, they do have drawbacks. They limit the wearer's field of operative vision. Unsuitable spectacle frames also cause headaches because they place pressure on the wearer's temples. Moreover, they often tend to give the wearer an aged appearance, detract attention from facial features, and cloud up in humid or wet weather.

Contact lens users wear them directly on the cornea of the eye. In a sense, they become part of the eye in this position and therefore offer a fuller vision field. Contact lenses are lesser affected by weather conditions, too. They are lightweight and unnoticeable once inserted. They do require special care and storage, however. When not in use, the user must place them in a clean storage solution.
Unlike spectacles, they also have a limited lifespan and need replacement after a certain period. Using contact lenses beyond the prescribed period can be dangerous. Despite these drawbacks, a majority of people prefer using contact lenses instead of spectacles.

Contact lenses are available in rigid (rigid gas permeable) and soft formats. They find application in vision correction (as substitutes to spectacles), changing of appearance (cosmetic), and for therapeutic purposes, too. In the latter case, eye doctors use special contact lenses to correct certain eye disorders. Therapeutic contact lenses can also protect the eye after surgical procedures. While some kinds of contact lenses have a long lifespan, other varieties are disposable daily, weekly, or monthly. With proper use, long-term contact lenses can last many months.

Probably one of the greatest advantages of using contact lenses is the fact that they can radically change the appearance of one's eyes. Since the user wears them in direct contact with the eyes, tinted or colored contact lenses can change one's eye color and bring about a considerable personality change. One can use colored contact lenses to sport eye colors such as blue, green, hazel, violet, honey, brown, amethyst, turquoise, gray and many intermediate shades. While the color change is only temporary, it is certainly dramatic. This makes colored contact lenses, with or without vision-correction features, very useful in filmmaking, modeling, professional photography and many areas of social life.

When contact lenses first came on the market, they were very expensive novelties that only a few could afford. As research and development advanced manufacturing techniques and caused competition, they became more affordable. As a result, almost anyone can buy contact lenses today.
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Aspheric Contact Lenses
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