Eye drops come into direct contact with the cornea, so one must be cautious when using them. Recently, the American "WebMD" published an article pointing out six details to be mindful of when using eye drops. Understand the ingredients. There are many types of eye drops, some dilate the pupils, others have different functions. It's important to understand their composition and effects before use. Mark the date. The shelf life of eye drops is usually one year, but after opening, they should be used within 30 days at most. Therefore, it’s best to mark the date on the bottle when you first open it. Check before use. If the eye drops accidentally touch the eyelashes or eyelids during use, the shelf life will be shortened. It's best to carefully inspect the eye drops each time before use; if there are any flocculent substances or sediment, they should not be used anymore.