The white film on the edge of the black eyeball of children’s eyes may be caused by corneoconjunctival dermatomas, corneal leukoplakia, conjunctival edema and so on. 1. Keratoconjunctival dermatoma: this is a congenital abnormality caused by the swelling between the black eyeball and the white of the eye, generally based on surgical excision. 2. Corneal leukoplakia: If the corneal edge of the child is traumatized or inflamed, it will easily lead to corneal scarring and corneal leukoplakia, which is manifested as a white film on the edge of the black eyeball of the eye. 3. Conjunctival edema: children exposed to pollen, dust mites and other allergens, allergic reaction caused by conjunctival edema, can lead to look like the phenomenon of the edge of the black eyeball white film, and often have eye itching and other discomfort. When a child’s eyes appear to have a white film on the edge of the black eyeball, parents should immediately take the child to the hospital, identify the cause of the disease and follow the doctor’s instructions for treatment.