I have a question, why does pain cause nausea? I have had for a number of years now intermittent, excrutiating left eye pain. I never know when it is coming or how long it will last, but often it get so bad I end up throwing up. I can usually sleep and it will be either more tolerable or even gone. My vision is not effected when this happens and I haven't had optic neuritis.
It is difficult to explain nausea associated with eye pain without doing a detailed eye exam.
However a common cause of eye pain that may be associated with nausea and vomiting is migraine headaches. Sometimes the pain from a migraine is localized to the eye but is not coming directly from the eye itself; rather the brain is perceiving pain from the eye but it is all due to a severe migraine headache.
You would need to see an ophthalmologist to make sure however there is no eye problem causing the pain and nausea (such as intermittent angle closure glaucoma, which is a much less common disease compared to migraines).
Benjamin J. Osborne, MD
Department of Neurology
MedStar Georgetown University Hospital.
Dr. Osborne is board certified in neurology, with concentrations in neuro-opthalmology and multiple sclerosis.