Contact lenses are obtainable for two dissimilar wear schedules. They are daily wear, signifying that one can remove them prior to sleeping, and extended wear or overnight wear. What fundamentally characterizes extended wear contact lenses is that they permit greater amount of oxygen to arrive at the cornea of the user.
The majority of extended wear lenses are intended to be worn without replacement for up to seven days. A new kind of soft contact lens material, silicone hydrogel, is regarded as “super-permeable,” and certain lenses that make use of this material can be worn up to 30 days without replacement. One type of gas permeable lens can be conveniently used as well. This 30-day kind of extended wear is occasionally described as “continuous wear.”
In the initial stages extended contact lenses were intended for use for a duration of two weeks without replacement. But later, they were modified so that they could be used for a 30-day period.
Extended wear lenses gradually gained in popularity following the introduction of disposable lenses that proved to be of immense help in eliminating the health risks associated with extended wear contact lenses. Earlier extended wear lenses were taken off on a weekly basis, but were used again for weeks or for months. Even though some type of lens care system was in place it was not sufficient enough to eliminate all the proteins, lipids, and additional deposits that accumulated on the lenses. These deposits created a likely reproduction ground for infection-causing organisms, and resulted in swelling and uneasiness.
Preventing long-term accumulation of deposits
- Presently extended wear contact lenses are usually disposable.
- If a person sleeps wearing lenses, not only he or she will take them off once a week, but discard them every week and begin with a new pair.
- This prevents long-term accumulation of deposits and enhances the health of the eyes.
A large number of users opt for ‘flexible wear’ which necessitates the use of extended wear contact lenses that generally should be taken off every night. Nonetheless, when a person prefers to sleep wearing them, a person can easily do so.
However, it should be borne in mind that sleeping wearing contact lenses entails a greater threat of difficulty in comparison to lenses that can be removed at night. An individual using extended wear lenses, can diminish the threat of infection by sticking to the doctor’s recommendations for lens substitution and care.
Studies reveal that several infections and other problems associated with lenses are linked to inappropriate cleaning and disinfecting. Individuals utilizing disposable extended wear lenses can eliminate the efforts linked to lens care. Hence, it’s vital to dispose of and substitute the lenses in accordance with the instructions of an eye care expert.