There are many reasons for 2 and a half year old baby’s eye pain, such as overuse of eyes, foreign body stimulation, refractive error, infection and so on. 1. Excessive eye use: babies look at the phone, TV or close-up eyes for a long time, because the eyes can not get a good rest, may cause visual fatigue, dry eyes, pain. 2. foreign body stimulation: baby if there is eyelid inversion, inverted eyelashes, or the eyes accidentally into the foreign body, can also stimulate the eye, so it will lead to the phenomenon of 2 and a half year old baby eye pain. 3. Refractive error: baby myopia, hyperopia and other refractive errors, if not corrected in a timely manner, can lead to eye fatigue, which can cause pain, soreness. 4. Infection: the baby’s eyes are infected by viruses, bacteria and other pathogens, which can also cause keratitis, conjunctivitis, blepharitis and other diseases, and therefore can show 2 and a half year old baby eye pain. There are many causes of eye pain in 2 and a half year old babies, and also need to clarify whether there is trauma or other reasons, if the symptoms can not be relieved, it is recommended to take the baby to the hospital in a timely manner, a clear diagnosis and then give standardized treatment.