It may be possible that you have Optical Neuritis which is the swelling of the optic nerve. Seeing your eye doctor is important to rule this out as Optical Neuritis can be linked to MS and other disease. If it is a one time event, don't spend much concern with it as it may be associated with a headache or eye strain.
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There are may causes of pain or discomfort in the eyes. See your optometrist as it would not be possible (or safe!) to obtain an accurate online diagnosis. == == Bcause the sun is BRIGHT!!!!!!!:) :)
If you've had an eye injury it can be from that, but if you have not had an eye injury, it can be a very serious problem. Seek medical attention immediately if you have pain on eye movement.