For the judgment of eye itching, if it is not accompanied by other symptoms, such as there is no discharge, no conjunctival irritation, etc, you can consider it as seasonal itch, at the same time, this seasonal itch may accompanied with symptoms of nasal itching, runny nose, sneezing. For the Chronic allergic conjunctivitis, you can use hormonal eye drops and allergy medication, which can quickly relieve the symptoms of eye itching, but you can only use them for a short-term. For acute allergic conjunctivitis, you should follow the doctor's direction, and use anti-allergic drugs. Dry eye may be also accompanied by eye itching, if you have this symptom, you can blink frequently, which can moisturize your eyes, and you can also drop some artificial tears to alleviate the symptoms of dry eyes.
Do you wear the contact lenses during the day? It may cause your eyes dry which may indirectly cause the itching pain. However, too much use of eyes during the day in front of computers will make you feel itching at night. You'd better take notice of having a good rest for the eyes and use some eyedrops to release the symptom for a while.