Inflammatory stimulation to eyes can also lead to tears in eyes, such as conjunctivitis, keratitis, iridocyclitis, scleritis, blepharitis, electro-optic ophthalmia and so on.
External stimuli: such as wind and sand, smoke, light, poisonous gas, conjunctival and corneal foreign bodies, abrasions and lacerations, corneal dermatitis and epithelial shedding, trichiasis, entropion of eyelids, incomplete eyelid closure, conjunctival exposure, etc.