Contact lenses are thin discs that when they are on the cornea of the eye serve as a substitute for eyeglasses. The conditions that corrected by contact lenses are the same as the conditions corrected by eyeglasses and include the following:
• astigmatism (distorted vision)
• Myopia (nearsightedness)
• Hyperopia (farsightedness)
• Presbyopia (need Bifocal)
Just as no two sets of fingerprints are identical, no two pairs of eyes are exactly alike either. For this reason there are different types of lenses for different types of eyes. Read below to find out what type of contact lens is right for you. Hard lenses
If you are looking for the cheapest alternative in prescription lenses, you should consider PMMA lenses. These were the first contact ever developed, and although they are not the common choice among carriers who are still manufactured today. This type of contact lenses is known as a rigid and perhaps a bit harder on the eye. They consist of material more stable than other types of contact lenses. These lenses are made of PMMA, a type of plastic that is extremely durable. You are not aware that the most comfortable lenses on the market, but are very durable, and easier on the budget as more comfortable options. This is not the best option for people with sensitive or irritated eyes.
Hard lenses, breathe
Rigid gas-permeable contact lenses, also known as also known as “RGPs” are a slightly newer version of hard (rigid) lenses made of plastic and other materials, including silicone. An important factor in this type of lens – Fluoropolymers allow oxygen go right through the lens, making it “gas-permeable.” Some of the advantages of RGP’s are that they are better at keeping their shape, creating a crisper drawer vision, they keep the eye moist, and they resist the dust and dirt. This type of prescription contact lenses is ideal for:
• Those whose eyes are overly susceptible to bacteria and are susceptible to infections
• Those who are vulnerable to suffering from dry eyes
• LASIK surgery candidate
• People who participate in sports –
• Users of Bifocal glasses and reading glasses
Soft lenses
Soft contact lenses are made of thin plastic and water. The water component gives the lenses a soft consistency and flexibility. Soft contact lenses let oxygen through also, so that the eye to breathe. The majority of prescription contact lenses in the U.S. use soft contact lenses. Some of the reasons that are provided are: the fact that they are more for convenience, are easier than hard lenses to adapt to and can be worn for longer periods. Some of the soft lenses on the market include the following.
Extended wear lenses
Extended wear lenses are soft contact lenses made of materials designed to operate over a long period. This type of prescription lenses can be worn for 1-4 weeks without removal and cleaning. Although these types of lenses allow oxygen to penetrate and they tend to keep the eyes moist, they are probably not the best option for people with sensitivity and irritability.
Disposable Lenses
Disposable lenses are designed to be worn for a limited period and then discarded. This type of lens is ideal for people with sensitive or irritated eyes. Although it is usually more expensive than other types of lenses, the fact that they are replaced daily by a new pair she holds a very low risk of infection.