What are the different types of contact lenses
Contact lenses are a great choice for almost anyone who needs vision correction and does not want to wear a pair of glasses full time or undergo LASIK surgery.
Basics you should know about contact lenses before you see your doctor (you are interested in getting acquainted).
Contact lens materials
The first choice when considering contact lenses is which lens components will best meet your needs. There are five types of contact lenses, depending on the type of lens material they are made of:
Soft lenses are made with hydrogels from gel-like, water-based plastics. These lenses are very thin and flexible and fit the front surface of the eye.
Silicone hydrogel lenses are made with an advanced type of soft contact lens material that allows more oxygen to pass through the lens and reach the front surface of the eye. Silicone hydrogel contact lenses are now the most popular type of contact lens.
Gas permeable lens. Also called GP or RGP lenses, these are rigid contact lenses that maintain their shape over the eyes and enable correction of implications and other refractive errors. Gas permeable contact lenses are smaller in diameter than soft lenses and are made of high oxygen-carrying materials. It takes some time to adjust the GP lenses for your eyes when you first start wearing them; However, after this initial adaptation period, most people find GP lenses to be as comfortable as soft lenses.
Hybrid contact lenses have a rigid gas conductive central region, surrounded by a "skirt" of hydrogel or silicone hydrogel material. They are designed to provide comfort that rivals wear soft or silicone hydrogel lenses combined with the crystal-clear optics of GP lenses.
PMMA lenses are rigid contact lenses that look like GP lenses but are a plastic component that is not accessible by oxygen.
Lens during communication
There are two types of contact lenses based on the recommended wearing time:
Daily wear contact lenses - these must be removed the night before bed.
Extended Wear Contact Lenses - These can be worn overnight (for a limited number of days).
"Uninterrupted wear" is a term sometimes used to describe extended lenses that are worn 24 hours a day for up to 30 consecutive days.
When to replace your contact lenses
Even with proper care, contact lenses (especially soft contacts) should be replaced frequently to prevent lens deposits and contaminants that increase the risk of eye infections.
There are these general classifications based on what soft lenses should be discarded most often:
Daily Disposable Lenses - Dispose of after one day of wearing
Disposable lenses - discard every two weeks or sooner
Frequent replacement lenses - leave monthly or quarterly
Dition Sharpenable (reusable) lenses - discard every six months or more
Gas permeable contact lenses are more resistant to lens deposits and do not require frequent disposal as soft lenses. Often, GP lenses can last a year or more before being replaced.
Contact lens design
Soft contact lenses (both hydrogel and silicon hydrogel lenses) are available in different designs according to their design purpose:
Spherical contact lenses have the same lens power over the entire optical part to correct myopia (nearsightness) or hyperopia (farsightedness).
Toric Soft Contact Lenses have different meridians of lens meaning and foresight as well as different abilities to correct compression.
Multifocal contact lenses (including bifocal contact) contain very long distances and farsightedness to correct prisiopia, as well as different power zones for different distances and telescopes. Some multifocal lenses can also correct the significance.
Cosmetic contact lenses include color contacts designed to change or intensify the color of your eyes. Halloween, drama and other special-effect contacts are also considered cosmetic lenses. Cosmetic contacts require a contact lens prescription even though you do not have any correction errors that need correction.
All of these lenses can be customized for hard-fitting eyes. Other lens designs are also available - including artificial lenses for use in special situations, such as Keratoconus modification.
Further contact lens features
Binomial communication for significance. These are advanced soft contacts that correct both presbyopia and significance, so you can stay glasses-free even after you turn 40, even if you have significance.
Contact for dry eyes. Are your contacts uncomfortably dry? A few soft contact lenses are specially made to reduce the risk of dry eye symptoms related to contact lenses.
Colored lenses. Many of the types of lenses described above come in colors that can enhance the natural color of your eyes - it's your.