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Eye pain that is worse in the morning and better as the day progress without any loss of vision can be caused by dry eyes
due to cornea exposure at night. Other conditions that can cause such eye pain include optic nerve problem as in glaucoma
, inflammation of the sclera
or episcleritis due to underlying autoimmune inflammatory connective tissue or collagen vascular condition. I suggest that you follow-up with your eye doctor for closer evaluation with tests including schmirer's test, ANA, ESR, C-reactive protein, ANCA panel, and intraocular
pressure check and optic nerve evaluation. In the meantime, I suggest that you use over the counter preservative free tear drop such as Refresh or Genteal tear drop 4 times daily during the day, and Lacri-lube gel or Genteal gel at bedtime.
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Please note that this answer is for information only. It cannot be substituted for the visit to or the recommendation of your doctor.