Everything has a shelf life, and contact lenses are no exception.Just for contact lenses, there are two shelf life.One is that the shelf life is generally five years without unpacking; the other is the replacement cycle, which is the period of use after the opening.The two shelf life periods are two completely different parameters and cannot be easily confused.
Contact lenses are generally marked on the outer packaging with the date of manufacture and shelf life.Unopened contact lenses, as long as they are kept at room temperature and protected from light, can be guaranteed to not deteriorate.However, it is generally rare to save for a long time after purchase.
Therefore, the proposed replacement cycle is obviously more important.This cycle should be counted from the date of unpacking. The yearly cycle is one year, the half-year throw is six months, the monthly throw is one month, etc.Specifically, it can be divided into different varieties, and you can choose the type that suits you according to actual needs.However, it should be noted that the discarding period is not calculated according to the number of days wear, even if it is only wear a few times, it should be abandoned immediately after expiration.Expired lenses will age rapidly, oxygen permeability will be drastically reduced, they will be easily deformed and deteriorated, and the comfort will be quite different. Therefore, in order to wear safely and eye health, it is even possible to discard them in advance.In short, when the contact lens is abandoned, it should not be lost.Don't lose big because of small.
In general, as long as it is not a daily throw type, lens care is required, and proper care can extend lens life.There will be protein precipitation when wearing contact lenses, which is the source of lens deterioration and foreign body sensation.After the lens is removed, put it in the palm of the hand, drip into the care solution, gently wash it from the middle to the periphery with the other finger belly, and the front and back sides are each 20 seconds. Finally, the lens is rinsed with the care solution.