The conjunctival sac is the space between the conjunctiva, where eye drops or ointment are most often ordered. The correct way should be to turn the lower eyelid over, put eye drops or eye ointment into the eye, cover it with the upper eyelid and turn the eye, which can make the eye drops or eye ointment evenly distributed throughout the conjunctival sac and play an effective therapeutic role. Therefore, if there is any abnormality in the eye, it is recommended not to use medication blindly, but to go to the hospital for a detailed examination to clarify the condition before choosing the correct medication, and the method of eye spotting must also be correct. If the method of eye spotting is not correct, for example, the eye drops do not reach the eyes, or too many drops flow to the outside, on the one hand, it will not be effective; on the other hand, it will also cause the waste of drugs, so it must be done under the guidance of a doctor.