What is the phenomenon of contact lenses expiring?
The contact lens has gradually become a new choice for healthy fashion, but the yearly and half-yearly still occupy the mainstream of the market.In fact, no matter which type of contact lens, there is a service life, that is, the abandonment cycle marked on the package, beyond which it can no longer be worn.So, what will happen after the lens expires?
From the outside, if the contact lens expires and does not expire, there is no difference. If the date is not recorded, it is difficult to tell whether the lens is still in the shelf life.Therefore, if you use a variety of contact lenses at the same time, be sure to mark them on the case to prevent confusion and forgetting.It should be noted that the life cycle of the contact lens is calculated according to the opening time, not the number of times of wearing or the actual wearing time.
However, from the moment of opening, the aging of the lens has begun.Once the service life is exceeded, the lens may be deformed and hardened, causing uncontrollable changes in diopter, affecting the vision correction effect, resulting in unclear vision.Moreover, the sense of foreign body and friction after wearing will be stronger, and the comfort will be greatly reduced.
After the contact lens expires, the particles deposited on the lens may cause corneal damage, and some minor injuries require professional equipment to detect.The deposited protein not only makes the oxygen permeability worse, but also becomes the best place for bacteria to hide. In the case of corneal damage, it is easy to cause infection and inflammation.
In fact, not only contact lenses need to pay attention to the problem of the use period, the care solution, case also has a shelf life, it is best to change every three months.Never take your own eyes to risk, you will suffer greater losses in the event of serious consequences.