Dry eye is a general term for a variety of diseases characterized by abnormal tear quality or quantity and kinetics from various causes, resulting in decreased tear film stability with ocular discomfort or ocular surface tissue lesions. To determine dry eye or other eye diseases, a clear diagnosis can be made through clinical manifestations as well as auxiliary examinations. 1, dry eye: the main symptoms include dry eyes, easy fatigue, itchy eyes, foreign body sensation, burning sensation, sticky secretions, photophobia, more sensitive to external stimuli such as sand, smoke and dust; sometimes the eye symptoms are dry, the basic tear deficiency, external stimuli cause reflex tear secretion, resulting in the performance of frequent tearing. More severe patients have red, swollen, congested eyes, corneal and conjunctival keratinization, and corneal epithelial damage, which can cause dry keratoconjunctival lesions and affect vision. The diagnosis can be clarified by tear film rupture time (BUT) measurement, corneal fluorescein (Fl) staining, tear secretion test (Schirmer T.) and other tests. 2. Other eye diseases: Since the diagnostic criteria for dry eye are vague, clinical manifestations have similarities with conjunctivitis, epidemic keratoconjunctivitis, viral keratitis, trachoma, etc. Common symptoms such as dry eyes, foreign body sensation, itchiness, blurred vision, etc. are often misdiagnosed as the above eye diseases. For patients whose symptoms persist for a longer period of time fail to attract attention, instead, the condition is aggravated by the long-term use of anti-inflammatory drugs and their own drug components, causing a decrease in tear secretion and worsening the dry eye symptoms.