In generally contact lens users are less likely to ignore the using cycle periods. After all, contact lens are bought according to the using cycle periods. Yearly lens means after using one-year need throw it. Half-year disposal means half-year need throw it, while monthly also same. Most of time, expired contact lenses don't have too much differences, so can be worn for a while?
Of course not! Contact lenses once expired, not only the lens will rapidly aging, but also the shrinkage of water will be greatly reduced, so that the lens will increase friction with eyeball. Wearing this king of lens will course a slight tingling feeling, and more easily feel dry and tears. Some people think they can be worn more often if the lens isn’t damaged. But in fact, no matter how seriously clean, there will always be protein precipitation residue on the lens, a little makes a big difference, and block the oxygen hole, aggravating cornea hypoxia. At the same time, protein deposits are also easy to become a place for bacteria gather and multiply, which can cause corneal ulcers, vision loss, and even permanent blindness.
In fact, contact lenses should be discarded in advance. The longer the discard cycle, the more severe the residue of protein precipitation. In generally speaking, the yearly contact lens should not be used more than 10 months, the half year lens should not be used more than 5 months, the monthly use only about 20 days. The expiration date of contact lens is 3~5 years, in this range can be trusted to use
Here i need reminding you that the eyes is a very delicate organ, do not continue to use expired contact lens in order to save money, once more than the using cycle periods must throw it immediately. If you're worried about forgetting the expired date, mark it on your contact lens case.