The proper way to apply eye drops is to pull the lower eyelid open and dispense a drop into the lower fornix. The second method is to look outward at the eye and dab the eye drops into the inner canthus. You cannot touch the eye directly, otherwise the eye drops will suck the fluid back into the bottle and contaminate the entire eye drop. Nor can you drop directly onto the cornea. Because of the large number of sensory nerve endings on the cornea respectively, which are very sensitive, the stimulation of the eye drops will cause the eye to close and squeeze the eye drops out of the eye, and the treatment effect will be greatly reduced. Studies have shown that only 3-5% of each drop of eye drops penetrate into the eye, 55%-65% is absorbed from the nasolacrimal mucosa into the blood circulation, so after dropping eye drops to compress the wall tear duct for at least 5 minutes, to lightly close the eyes and sit still for 2 minutes to reduce absorption poisoning. Joint alternate eye drops need to be ordered at least 10 minutes apart. The preservation of eye drops should also vary. A large number of biologically active biological agents are currently in clinical use and require cryopreservation. For example, Bevosol ophthalmic solution and ophthalmic gel are required to be stored at 2 degrees to 8 degrees. Some patients prefer to keep them in their trouser pockets for the convenience of medication, but in fact the drug activity will be significantly reduced. The number of times the eye drops are used is determined by the concentration of the drug after absorption and the length of time it is maintained. It is not possible to increase or decrease the number of times of use at will. For example, if the treatment of glaucoma, Timoxinan eye drops only need to be ordered twice a day, the point more may appear cardiovascular system and respiratory system side effects. Such as bradycardia and breathing difficulties, induced bronchospasm, asthma, etc.. There are even reports of death. For some eye diseases that need to increase the blood concentration of the eye surface in a short period of time, it is necessary to increase the frequency of dosing. Such as acute bacterial corneal ulcer eye medication needs to be ordered every half hour, or even every 10 minutes. Long-term use of eye drops to prevent the toxic side effects of eye drops preservatives. Bottled eye drops all contain preservatives, but different manufacturers use a variety of different preservatives with different levels of toxicity. Now various manufacturers have introduced a single dose of eye drops without preservatives. The volume of each stick is about 0.2-0.3ml and is limited to the same day use only. Relatively speaking, the eye surface of this dosage form of eye drops will be less affected. Many people suffering from eye diseases think that just buying eye drops at the drugstore will solve the problem. In fact, most diseases in the eye require eye drops for treatment, and it is essential to choose the right eye drops and master the correct method of use.