There are mainly two types of contact lenses, soft contact lenses and rigid gas permeable (RGP) contact lenses. Both of the lenses require a valid prescription. The soft contact lens is basically soft and flexible. A bit like a piece of thick cling film making them more comfortable than rigid gas permeable lenses to use. It is made of plastic as well as other materials like silicone-hydrogels that help to allow more oxygen to the cornea during using it.
Rigid gas permeable (RGP) contact lenses are more durable than soft contact lenses and give a sound and clearer vision. It is made of plastics and other materials like silicone or fluoropolymer. Recently more improvement has been done to allow more oxygen through the lens. It is smaller than the soft lens which is placed within the coronal area. It has a high range of materials, good ability of setting, variety of design designs and power. Some users believed that it is healthier in terms of long-term full time use than soft contact lenses. The main disadvantage of this lens is it requires more time to get used than soft lenses. But, by using regularly, it may be comfortable for the users.
The soft contact lenses are the first choice of the most contact lens users. It can be different types depending on how someone wants to wear it.
Extended wear contact lenses are usually used for overnight with a range of one to six nights. But, it should be removed at least once in a week for thorough cleaning and sterilization. It is suggested that it is not right to use it continuously overnight. Due to continuous uses of the lens the possibility of corneal infection increase.
Disposable-wear lenses sometimes referred to as “disposable” by lens seller. They are less expensive but more convenient to use. It is removed in every night and should be replaced daily to monthly basis. After that it is thrown away. Disposable-wear lenses are often prescribed for the people who have allegoric problem. It should be cleaned perfectly before reusing it.
Bifocal or multifocal contact lenses can be both soft lens and Rigid-Gas-Permeable (RGP) Contact Lenses. Sterilization and cleaning depended on lens materials. They have less visual quality comparable to single vision lens. They are mainly prescribed for the people to correct presbyopia.
Circle contact lenses are the lenses which are used to change eye color or appearance. In the case of circle contact lenses they also enhance the appearance of your eyes. Circle lenses make your eyes appear larger as they have an extra-wide outer ring which makes the iris of your eyes bigger.