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Types of contact lenses
Contact lenses are an attractive choice for almost anyone who requires vision correction and doesn't desire to wear eyeglasses full time. Here is the basics information you should know regarding contact lenses types, use, and care before seeing your eye doctor.
The material of Contact Lens
If you are interested in using contacts, check its material. The first option when thinking to buy contact lenses is which lens material will fully meet your requirements. There are five kinds of contact lenses, based on the type of lens material.
Soft lenses
These types of lenses are made from hydrogels, which is a gel-like, water-containing plastics. These types of lenses are fragile and flexible and adapt to the front cover of the eye. Soft lenses were founded in the early 1970s; hydrogel lenses are popular because they are immediately comfortable.
Silicone hydrogel lenses
These types of lenses are a rare type of soft contact lenses that are more acceptable than regular hydrogel lenses and provide even more oxygen to enter the cornea. Silicone hydrogel lenses Launched in 2002, and now these silicone hydrogel contact lenses are the most popular lenses in the United States.
Gas permeable lenses
GP or RGP lenses also know these types of lenses. Rigid contact lenses that seem and feel like PMMA lenses but are permeable and allow oxygen to pass by them. Because they are porous to oxygen, GP lenses can be adjusted closer to the eye than PMMA lenses. Since their initiation in 1978, gas permeable contact lenses have mostly replaced nonporous PMMA contact lenses. GP contacts often produce sharper vision comparing to soft and silicone hydrogel contacts, particularly if you have astigmatism. Gas permeable lenses take some time for your eyes adjustment; after this initial adjustment period, most people find GP lenses easy as hydrogel lenses. Don’t forget to use Perfect Lens World coupons for a big discount.
Hybrid contact lenses
These types of lenses are designed to give wearing comfort that opponents soft or silicone hydrogel lenses, joined with the crystal-clear optics of porous gas lenses. These lenses have a hard gas porous central zone, enclosed by a "skirt" of hydrogel material. Use Perfect Lens World coupons and save.
PMMA lenses
PMMA lenses are manufactured from a transparent rigid plastic material called polymethyl methacrylate, which also is utilized as a replacement for glass in shatterproof windows. PMMA lenses have high-quality optics, can be challenging to adjust because they do not transfer oxygen to the eye. These "hard contacts" have mostly been displaced by GP lenses and not often prescribed. It’s easy to use Perfect Lens World coupons to get a discount. You can buy your favorite lenses at a deep discount by using Perfect Lens World coupons.
Contact Lens Wearing Timing
Till 1979, who wore contact lenses detached and washed them regularly. The intro of "extended wear" allowed wearers to rest in their contacts. Presently, two kinds of lenses are divided by wearing time:
Daily wear
These types of lenses must be removed nocturnal.
Extended wear
But the other type of Extended wear can be used overnight, generally for seven days continuously without extraction.
When to Renew Your Contact Lenses
Even with full care, contact lenses should be renewed periodically to prevent the build-up of lens coats and pollution that enhance the risk of eye infections. Soft lenses have these generalized classes, based on how frequently they should be dropped:
Lens Replacement Cycle
Daily disposable lenses discard them just after a single day of wear
Disposable lenses need to Discard every two weeks, or maybe sooner
Frequent replacement lenses Discard quarterly or monthly
Traditional lenses Discard after six months or higher
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