Do you wish to buy contact lenses? There are vast amounts of cheap contact lenses available on the market. In fact, you can make a purchase online and not bother going to an eye specialist at all if you want to. However, certain situations command specific kinds of lenses. Though commercial non-prescription contacts are popular, it might be advisable to choose the right lens to fit your needs. Not all people can wear contact lenses because of certain situations and conditions. Before you buy contact lenses from anywhere, always consult an optician in order to achieve the best solution for your specific requirements.

A brief on contact lenses
These are thin, curved and lightweight plastic disks that are designed to cover the cornea. The contact lenses are applied directly on the eye surface, specifically to the film of tears around the cornea. The surface tension that allows water to cling onto glass allows the contacts to hold on. It provides an amazing alternative to conventional glasses based on your sight and the lifestyle that you live. In various countries, contacts are so popular that millions of people are wearing them. They are not only stylish, but they address specific conditions.

Corrective purposes
When you first purchase cheap contact lenses, it is advisable that you have had a consultation with an optician about your condition. Here are the most common conditions that are corrected by contacts. First, you have myopia which is nearsightedness. Other conditions include hyperopia or farsightedness, astigmatism or distorted vision and presbyopia (the need for two kinds of vision correction or more).

Nowadays, you can find tinted lenses that can enhance the eye colour or even change it radically, without affecting your field of vision. Contact lenses are also being used nowadays for therapeutic purposes, being effective for certain eye diseases where the cornea may be uneven and causes blurry vision like scarring (keratoconus).

Before you buy contact lenses, you have to consider your health first. An optician can give you a general overview on what to use based on your eye condition, and will offer advice if you have certain allergies to plastic materials. Since soft plastic lenses are very popular, you might need to choose a more suitable alternative for the sensitive eye surface, especially if your eyes tend to dry quickly.

Choosing lenses
When you buy contact lenses, you will find that there are 3 major categories to choose from: the PMMA, gas permeable and soft contacts. PMMA are the rigid contacts that hold claim to the fact that they were the very first kinds of lenses ever made that had any appeal to the consumer market. The lens was created in the 1960s and stands for polymethyl methacrylate which is extremely durable and offers crisp vision, but is not as permeable as other materials. They are not comfortable to wear for long periods. Although these lenses tend to be cheaper they are rarely offered over other lens types.

Gas permeable is also known as RGP and is a unique kind of hard lens that is made of plastic material and other polymers like fluoropolymers and silicone. The material is solid, but has a permeable membrane allowing oxygen to penetrate the eyes and can offer better comfort while avoiding irritation.

The soft lenses are also made of plastics but they were incorporated with water which helps to make the plastic components softer and more flexible, therefore achieving incredible comfort. It is the most common kind of contact lens worn across the world. These lenses can be obtained to suit many symptoms, including toric contacts for astigmatism, disposables lenses that are suitable to fight infection or for one time use and extended wear lenses that can be used for a period of up to a month before disposal.

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