Contact lenses offer an attractive alternative for those who have vision defects but prefer not to wear glasses. There are a wide variety of different contact lenses on the market. Some are geared to special vision needs, others offer conveniences such as extended wear, and still others cater to the whims of fashion-conscious folks who like to change the appearance of their eyes. A little investigation into the various types of contact lenses available can provide valuable information before making a final purchase.
Soft vs. Rigid
Soft lenses are valued for their comfort, whereas rigid lenses are more durable. The website All About Vision notes that the average pair of soft contact lenses can be used for about a year. Rigid gas permeable lenses can last longer than that.
Daily Wear vs. Extended Wear
The website All About Vision explains that extended wear contact lenses are constructed of materials that are different from those in daily wear contact lenses. The composition of extended wear lenses allows for more flow of oxygen through the lens. This enables safe use of the lenses while sleeping.
Disposable daily wear lenses are desirable for the convenience factor. By using a new pair of lenses each day, the wearer is less likely to experience protein buildup that can irritate the eye. Also, with disposable lenses there is no need to purchase contact lens soaking and cleaning solutions. There is one disadvantage; daily wear lenses can be more costly than other types.
Lenses can vary in their wearing schedules. Planned replacement lenses are often replaced on a monthly or bimonthly basis. Disposables can last a day or up to two weeks.
Corneal Reshaping Lenses
Some lenses can actually improve a person’s ability to see even when they aren’t wearing their lenses. Orthokeratology is a process wherein a special lens is worn, often overnight, to reshape the cornea and improve the vision to the point where no corrective lenses are needed. Unfortunately the process is temporary, but a person who uses orthokeratology can usually experience at least 24 hours of improved eyesight before having to wear the lenses again.
Colored Contact Lenses
The Department of Opthamology and Visual Sciences at the University of Illinois at Chicago describes two types of tinted soft contact lenses: those that lighten dark eyes and those that darken light eyes. These tinted, cosmetically enhancing lenses do not alter a person’s ability to perceive colors. A number of contact lens companies also sell costume contact lenses, with an array of alternative looks that are suitable for Halloween, costume parties or theatrical use.
