My right eye began hurting a day or two ago -- an aching pain, although the eye looks fine. Today it is worse -- quite painful to look up, down or to the side, accompanied by pain on the side of my head. I use a CPAP machine and I know the humidifier is not operating properly at present. But I would assume this would not impact only one eye or side of my face. My thyroid and PTH levels were checked recently and are normal. I am extremely near sighted, but my vision with my glasses is not impacted.