With the increasing attention to eye protection, more and more young people like to carry a bottle of eye drops in their pockets, from time to time to a few drops, hoping that, like the movie stars in the commercials, eyes bright and refreshing, to drive away the “red blood”. However, there is a lot to learn from a small bottle of eye drops. First of all, we need to be most concerned about whether there are side effects of using eye drops. It should be said that any kind of eye drops, even if it is a saline solution that does not contain any drug ingredients, may have certain side effects. This is because the tears secreted by our normal people contain many biologically active ingredients and electrolytes, such as lysozyme that can inhibit the growth of bacteria in the conjunctival sac, and no matter what kind of eye drops, they are still far from the normal physiological tear components, so they will dilute the beneficial components of tears and destroy the physiological barrier and defense function of tears. And, most eye drops, more or less, contain a certain amount of preservative ingredients, after long-term use, these preservatives may cause damage to the conjunctival cells, leading to the emergence of dry eye disease. It is especially important to note that some eye drops contain hormonal ingredients, and some young friends feel comfortable after ordering them, but they do not know that long-term use can cause hormonal glaucoma and cataracts, leading to visual field damage, and in serious cases can be blind. So even if there are special circumstances that require the use of hormone-containing eye drops, they must be used under the strict guidance of a doctor, and the intraocular pressure must also be checked regularly. It may also cause systemic side effects, such as asthma, heart attack, mental abnormalities, etc. Doctor’s note: Eye drops are not water. Before using eye drops, you should consult your doctor’s advice in detail and follow your doctor’s instructions regarding the number of times to use and the time to order eye drops.