The earliest history of contact lenses can be dated back to 1960s. And now there are various categories of lenses, as soft, disposable, and so like. It is evident that more new products have been mushroomed with the renewal of technologies.
Generally, soft lenses, as their name indicates, are soft to wear, and can be used for one year or 18 months. But they can not be worn overnight while sleeping. These lenses are very popular before the emergence of disposal lenses. But their prices are not very expensive, and they are very peculiar to prescribe. Still more, they require high on sanitation, for some eye wastes may be gathered on them.
Later emerge the disposable contacts, which are prompted by Johnson & Johnson Acuvue. Designed for 2-week wear, they are very comfortable to wear, because their manufacturing materials are soft hydro gel. But before their emergence, these Acuvue lenses have been halted for some reason.
The 1990s has witnessed the emergence of silicon hydro gel lenses, which are designed for 1-month wear. The new type is much advanced in the function of letting oxygen flow. And almost people can wear them, with a ration of 98%. But these exists some sort of potential risks that the possibility of 1 in every 500 people may be infected by microbes or some problems on cornea.
The latest new silicon hydro gel lenses that can provide more moistures and comfort for the wearers are prompted by CIBA VISON and Johnson & Johnson. They are delicately designed and treated.
Presently, there are more and more people tend to wear disposable hydro gel lenses. Of course, the most famous brands are Johnson & Johnson Acuvue and Ciba Vision. The daily lenses released by them can assure sufficient moisture for wearer everyday. People have no need to worry any side-effects or potential infection by wearing these lenses, for their manufacturing is the results of the latest techniques.
People can buy theses lenses from online stores which provide some discount and more convenience. But something still need to be noticed, as paying regular visit to eye doctors are essential.
Before wearing these lenses, be sure that your eye white are normal. Such things should be done every day, to make sure that there is no discomfort in your eyes. If you find anything abnormal in your eyes, do not wear them and see your doctor.
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