A contact lens is a thin, curved lens that is placed directly on the film of tears present on the surface of the eye. These lenses introduced in the late 19th century are now worn by millions and millions of people all over the world. They tend to move with your eye allowing you to get a more natural field of view. The absence of frames provides an unobstructed vision and also reduces distortions. They also do not fog up or get splattered by dirt or rain making them great for sports or other outdoor activities.
A contact lens may be made of hard or soft materials. The soft lenses are made from hydrogels which are gel-like water containing plastics. These lenses are extremely thin and pliable which sits on the front surface of your eye. Introduced in the early 1970s, these lenses gained popularity because they provide immediate comfort. Silicone hydrogel lenses are an advanced kind of soft lenses which are highly porous and allow more oxygen to reach the cornea. Daily wear soft lenses are great for people with active lifestyles while extended wear lenses can be worn overnight and even up to seven days without removal. Extended wear disposable lenses are also available which can be worn for extended periods of time and then be discarded. These types of lenses require little or no cleaning and also reduce the risk of eye infections. Rigid gas-permeable or RGP lenses are rigid contact lenses that are made using slightly flexible plastics which enable oxygen to pass through to your eyes providing excellent vision. RGP lenses are permeable to oxygen and fit close to the eye making them comfortable and providing a sharp vision.
Eye contacts are medical devices that can be worn as a corrective lens or for cosmetic and therapeutic purposes. The corrective contact lenses are one of the most popular versions of lenses that aim to help people who have difficulty seeing. They are used to correct myopia, hypermetropia or even presbyopia. This types of the lens also have the appropriate medication for your eye and adjust your vision so that you can see better. Bifocals or progressive lenses having multiple focal points are also available which are designed for constant viewing through the center of the lens. Single vision lenses help to focus one eye for distance vision and the other for near work.
Cosmetic eye contacts are one of the most popular versions of contact lenses that are designed to change the appearance of the eye. Most of these lenses are made to make you look more fashionable and changing your overall look by changing the color of your eyes. There are colored lenses which cover the iris completely while others just tint the iris, beautifying and improving its natural color. They may also correct refractive error. Another type of contact lens is the therapeutic lens which is mostly used to correct the “lazy eye” illness as it provides a cooling effect and gives a bit of protection from dirt and dust.