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Nowadays, we cannot live without mobile phones and computers in our daily life and work. We stare at the screen for hours. At the end of the day, dry eyes, sore eyes, eye fatigue and other symptoms all appear. Resting with eyes closed doesn't seem to work. At this time, we need to take out eye drops and drop a drop to relieve eye discomfort. Some friends use eye drops as long as they are not expired after opening them. This is actually wrong. Eye drops cannot be used continuously before the expiration date!

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Why can’t eye drops be used before their expiration date?

Many friends believe that the shelf life of eye drops is relatively long, usually 2 or 3 years. Therefore, after opening the bottle, as long as it has not expired and there is no sediment, it can still be used.In fact, this idea is wrong. The shelf life of 2 or 3 years generally refers to the unopened state.

Most eye drops contain preservatives.Once opened, if not used up after 4 weeks, discard immediately.After the eye drops are opened, the storage environment has changed and the efficacy will gradually weaken.

In addition, during use and storage, the bottle cap is placed randomly or not tightly closed, which may cause the bottle mouth to be contaminated, resulting in contamination of the eye drops. Contaminated eye drops can easily lead to secondary eye infections, such as conjunctivitis and even keratitis.