Contact lens, also known as corrective glasses lenses, are thin clear lenses put directly on your eye’s surface. Contacts are highly functional ocular prosthetics used by more than 150 million individuals worldwide, and they’re worn to correct bad vision, restore eyesight, or for personal or therapeutic reasons. The following paragraphs will provide you with the basics on how contact lenses work, and the main types of corrective lenses on the market today.
First off, contact lens material comes in three different varieties. Soft contacts are made from silicon hydro gel, which is an extremely hard material that doesn’t provide a great deal of oxygen flow, which often causes irritation and discomfort when wearing contacts. Additionally, the material is porous and can easily get contaminated. Metamucil, a common contact cleaning agent, provides some amount of oxygen flow to the eye while also preventing bacteria from attaching itself to the eye’s surface. And last but not least, rigid gas-permeable contacts use a thick layer of polycarbonate called “hard gas” to seal off the eye’s surface. These are some of the most commonly used types of contacts.
Now that you have an understanding of what contacts are, it’s time to talk about what some of the most common types are. One option is a water-based contact lens material. This type is the least expensive type and also typically offers the best comfort. However, these lenses should be avoided for those with dry eyes because they don’t provide moisture to the eye and instead can dry the eye out, causing increased inflammation. Plus, while they do offer a nice smooth surface, they can get smeared and generally can even cause eye fatigue if not properly cleaned.
Another option is hydrogel lenses. These lenses are designed to offer the same benefits as rigid gas-permeable contacts, with the exception of the fact that they don’t dry out the eye’s surface like the former type. They are also great because they don’t clog the eye’s drainage system like rigid gas-permeable lenses can. Like contact lenses made of silicon, these lenses must be prescribed by an eye doctor, but they are available at many eye doctors’ offices.
If you have good vision, you may want to consider “light filtering” contact lens designs. These designs cover a significant portion of the spectrum of vision conditions, such as farsightedness, nearsightedness, astigmatism and presbyopia. Plus, while these lenses are a little more expensive, they also tend to be much better than their less expensive counterparts in terms of comfort and convenience. Many of these soft contact lens designs are available in disposable form, meaning that you only need to wear them a single time to treat your symptoms. Additionally, many of these designs offer a progressive alignment system so that you wear the lenses over a period of time, gradually improving your vision.
A few decades ago, the most common vision correction used was rigid gas-permeable lenses. While they still dominate the market, today’s soft contacts are actually preferred. In addition, these lenses don’t dry out the cornea like rigid gas-permeable lenses can, so they don’t irritate the eye. Additionally, these newer contact lens designs often include clear water retention solutions that serve to lubricate the cornea and provide additional moisture to stop dryness. This results in fewer dry eyes and reduced glare from bright lights, which can significantly improve the quality of your vision.