What is the life cycle of contact lenses?
For the wearer, the life cycle of contact lenses is an important parameter as much as the production date. Before unopening, the expiration date of the contact lens needs to refer to the production date, and after opening, the expiration date of the contact lens needs to refer to the use period marked on the package.
According to the life cycle, contact lenses can be roughly divided into two categories: traditional and discarded. The traditional type generally refers to contact lenses with a use period of more than 3 months, that is, annual or semi-annual disposal, while the disposable type is a short-period contact lens with a use period of less than 3 months, including the shortest daily period and even the cycle The longest quarterly sale.
The characteristics of traditional contact lenses are very distinctive. Because of their long service life, they tend to be more durable in lens technology. They also reduce the production of protein precipitation by reducing the water content. The lens has high toughness, good molding, and is not easy to break. Can withstand repeated cleaning.
Disposable contact lenses are more in line with the concept of shorter, healthier, and more emphasis on improving oxygen permeability and comfort, so the lenses are soft and have high water content. Especially for daily disposal, it is convenient to carry and discard as you use it, which greatly saves the time of care and cleaning, and takes into account both hygiene and safety.
The two types of contact lenses have their own advantages and disadvantages, and the selection should be based on actual conditions and needs. For those who are just getting started and those who are prone to dry eyes, the traditional type that is easy to wear, cost-effective, and low water content is more suitable. If you don't wear it often and you always go out, buying a disposable type can save a lot of trouble.
In the process of using contact lenses, many people ignore the use cycle and forget to record the opening date, which leads to overdue use and eye diseases. Contact lenses that have exceeded their service life can not be worn even if there is no change on the surface. For eye safety, they can sometimes even be discarded in advance.