How should the shelf life and use cycle of contact lens be calculated?

Anything has a shelf life, and contact lenses are certainly no exception. Wearing expired contact lenses is very harmful, serious may also lead to blindness, today, author for you to answer the shelf life and use cycle should be calculated how.

In the case of unopened, contact lenses can be kept for five years, individual three years, the specific packaging information shall prevail. Contact lenses beyond the shelf life have the risk of material degradation or lens contamination, which may be bad for wearing. You should pay attention to check the production date and expiry date when buying.

The use cycle generally refers to the recommended use period after opening, that is, we often say the throw, will be clearly marked on the outer box of the contact lens. One day is a disposable wear. Even if it, it must be thrown away and replaced with new lenses the next day. Biweekly, monthly throw, quarterly throw as the name suggests, the use cycle is two weeks, a month and three months respectively, during this period even if only wear a few times must be replaced. Half a year throw, year throw are long cycle contact lenses, although has been very popular, but in recent years due to the material update, long throw because of the use period is too long, not enough health and questioned, but it is better in high cost performance, strong toughness, it is not recommended to wear, can be replaced a few months in advance.

It should be noted that the use cycle can not be calculated according to the number of wearing and the number of wearing days. As long as it is unsealed, no matter several times or several days, it should be calculated from the date of opening, no wearing should also be included in the time, and should be abandoned in time after the expiration. So, you can prepare some urine tags to write the unsealed date and toss, posted on the contact lens box for easy inquiry.

The significance of different throwing types is to meet various wearing needs and scenes. The applicable population of short throw is short-term travel, temporary wear, frequent travel, daily throw is without care, while long throw is more suitable for daily commuting and other frequent wearer, must be strict care, to avoid protein deposition.

Excessive wear may lead to lens aging, material change, a great risk of pollution, and even scratch the cornea leading to serious visual damage. Therefore,author reminds everyone to strictly follow the throwing period, control the wearing time, standardize the nursing process, and always take safety as the first principle.