Is it good to have high cooling power in eye drops? How long can eye drops be used after opening?

Eye drops are used to protect the eyes and are familiar to many people. Do you think these eye drops have a cooling effect? How long can eye drops be used after opening?

Is it good to have high cooling power eye drops?

Not necessarily. The coolness should be appropriate. Too high a temperature will irritate the eyes. It is recommended to use eye drops with too high cooling power in small amounts and not too frequently. The cooling degree of eye drops refers to the degree of cooling felt when the eye drops are dropped into the eyes, but the higher the cooling degree is not necessarily better. It depends on your tolerance. If it is too high, it will be very irritating and easily sting your eyes, which is almost the same as dropping wind oil into your eyes. So when choosing a cooling degree, don't choose one that is too high. Generally, 3, 4, or 5 are fine.

The wind is strong and the air convection is fast, so parasols are not practical and will increase the burden of climbing.

How long can eye drops be used after opening?

It is usually 4 weeks, or one month.

The shelf life of eye drops is indeed relatively long, generally one to two years. However, the shelf life of eye drops after opening is only 4 weeks. The shelf life on the eye drops packaging usually refers to the unopened state. Once opened, if it is not used up within 4 weeks, it should be discarded immediately.

After the eye drops are opened, the storage environment changes and the efficacy will gradually weaken. Because eye drops are liquid medicines with relatively poor stability, once the bottle cap is opened, they are prone to physical and chemical changes due to contact with air, causing the eye drops to become ineffective. The drug ingredients may even decompose and produce harmful substances, causing damage to the eyes. Moreover, opening and closing the bottle cap multiple times can easily cause bacterial contamination, which can easily lead to eye infections after use. Therefore, eye drops can be used within 1 month after opening the bottle cap. If it exceeds 1 month, even if the appearance of the eye drops has not changed, they should be discarded and not used again. Leaving them for a long time may cause health risks.

Note: Most eye drops on the market have preservatives added, so the one-month shelf life after opening mentioned above refers to those with preservatives. For some eye drops that do not contain preservatives, if they are opened, their shelf life will be even shorter, only about a week. Of course, it is recommended to buy eye drops that do not contain preservatives. Long-term use of eye drops containing preservatives can also cause ocular surface damage caused by the preservatives themselves.

The cooling degree of eye drops is not the higher the better. This one can be used for 4 weeks after opening.