Dry and itchy eyes are a very common symptom of the eye, usually due to the following reasons: 1. Chronic conjunctivitis, usually related to the untimely treatment of acute conjunctivitis, resulting in prolonged illness, and long-term contact with formaldehyde and other air pollutants in the eye. 2. It is also known as allergic conjunctivitis, which is the most frequent in spring, and is caused by common allergens such as pollen, pollen, smoke, dust, etc. It is not very related to diet, etc. 3. In severe cases, stinging pain and photophobia may also occur.