In general, mono does not very much harm to eyes, therefore, it might not be possible too get eye pain from mono record. If you feel pain in your eyes, check your eyes and see if there is any foreign body in your eyes that make your eyes uncomfortable. Then use clean handkerchief to wipe it out or use flowing water to wash it out. There is another reason for your eye pain. You may overuse your eyes without any rest. The muscles of the eyes will be too fatigue and will ache when your read or watch for too long. You should take a break when you have read or watched for an hour to allow your eyes to have a rest. Use some eye drop to alleviate your eye pain and do some eye exercises from time to time. If the pain in your eyes still remains, you had better go to the doctor's for an eye examination in case there is any pathological changes of eyes.