Contact lenses and glasses are some of the most recommended visual aids in the world. Frankfort contacts & glasses are also of excellent quality.
Contact lenses are a more recent invention than glass lenses but they have a lot of benefits when it comes to improving vision. There are numerous types of contact lenses but in this article, we will look at the different types of contact lenses according to certain attributes such as materials, design, and use.
The following are the different types of contact lenses:
Soft lenses are made from hydrogels which are gel-like plastics that contain water. They are very thin and flexible, making the soft lenses great to wear for extended periods of time.
Since their introduction in the 70s, they have been the most popular material for contact lenses due to their comfort. They make about a quarter of lenses prescribed today.
Silicone Hydrogel Lenses
Silicone hydrogel lenses are by far the most common lenses in the world. They are similar to soft lenses but they are more advanced and are more porous allowing more oxygen to enter than other lenses.
Silicone hydrogel lenses account for over 60% of contact lenses present today.
Rigid Gas Permeable (RGP) Contact Lenses
There are contact lenses made with rigid gas and have tremendous benefits when opposed to other types of contact lenses. They are more durable and resistant to the buildup of deposit which leads to more vivid vision than with other lenses.
In the long run, they are cheaper than soft contact lenses since they are more durable. On the other hand, they take some getting used to and may take several weeks before you feel comfortable wearing them.
Daily Wear and Extended Wear Lenses
When contact lenses are categorized based on the amount of time you can wear and remove them, you get daily wear and extended wear contact lenses. The names of the lenses give it all away.
Daily wear contact lenses are meant to be removed and cleaned every single day. Extended lenses are usually worn for seven consecutive days though there are some FDA approved contact lenses that can be worn for a month straight.
Disposable Contact Lenses
You can also categorize contact lenses based on how often they need to be replaced. Such lenses are also called replacement schedule contact lenses.
Disposable lenses as used by the FDA means a lens that is used once and then discarded. However, there are lenses that are disposable after a day while others are disposable after two weeks.
There are disposable lenses that are discarded after a month while the disposable lenses that are worn the longest last for about six months.
Contact Lenses by Design
When you categorize contact lenses by design, you get a long list of lens types. Only soft lenses can be altered into such designs.
You will have concentric lenses which are lenses that have rings throughout the lenses.
Aspheric lenses have close up prescriptions in the middle but far distance modification towards the end of the lens. Multifocal lenses including bifocal lenses are types of aspheric lenses.
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