Left eyelid jumping for almost a month may be visual fatigue, facial muscle spasm, keratitis and other diseases caused by the patient should consult a doctor in a timely manner to clarify the cause of treatment. 1. Visual fatigue: if in the left eyelid jumped almost a month, such people have a long time to use electronic products, stay up all night experience, should be considered to be fatigue caused by such people should pay attention to rest, moderate exercise, if necessary, you can use artificial tears. 2. Facial muscle spasm: it occurs in women aged 40-60 years old with paroxysmal involuntary twitching of unilateral facial muscles, and the patients will have symptoms such as persistent jumping of one side of the eyelid, tinnitus, crooked mouth, and difficulty in opening the eyes, etc. It can be treated with medicines such as Carbamazepine, baclofen, and so on. 3. Keratitis: left eyelid jumping for almost a month may be caused by keratitis, such patients will also have eye pain, photophobia, vision loss, blurred vision, can be under the guidance of the doctor to use ganciclovir and other drugs for treatment. The left eyelid jumps for a long time, it is recommended to consult a doctor in time to receive the correct treatment, so as not to delay the condition.