Dry and itchy eyes are usually considered to be related to dry eye syndrome. In addition, patients who have allergic conjunctivitis may also experience dry and itchy eyes. The occurrence of dry eyes may be related to inadequate tear secretion, such as systemic diseases, inadequate tear secretion due to age factors; or excessive tear evaporation, for example, caused by frequent work in air-conditioned rooms, frequent prolonged computer use, or night driving, as well as lid gland dysfunction, blepharitis, eyelid defects, etc.; or abnormalities in tear dynamics. Clinical symptoms often include dryness, burning, itchy eyes, foreign body sensation, photophobia, redness, blurred vision, and fluctuating vision. Therefore, if dry eye is diagnosed, the first step is to remove the cause and treat the primary disease. Topical treatment of the eye is usually considered with preservative-free artificial tear drops as well as gels, non-steroidal anti-inflammatory drugs, etc. Try to stop using cosmetics as well as contacts, and medications that tend to cause dry eye, such as sedatives, antispasmodic drugs, etc. In prolonged allergic conjunctivitis, the eyes may become red and itchy because prolonged use of anti-allergic eye drops may affect the function of the conjunctival cupped cells, and dry eyes may also occur. Therefore, it is recommended to use topical anti-allergy along with preservative-free artificial tear drops to spot the eyes.