Hi,
Drooping eyelids may be also a sign of a muscle disease. If you have increased sensitivity to light because of dry eye (not uncommon for contacts users) or another problem, the need to squint can aggravate muscle fatigue. I probably know what you are talking about, I have my eyes "closing by themselves" in the bright light, I do not have difficulty opening them, but I have difficulty keepng them open. In my case it is associated with the combination of dry eye and a muscle disorder. I agree with the previous comment - go see a neurologist and ophthalmologist, and they may refer you to a neuro-ophthalmologist. Meanwhile, you may want to try lubrication drops several times a day - and wear sunglasses whenever you need them. (I wear sunglasses even on a rainy day and after the sunset, especially while driving). Hope this helps.
Hi
Welcome to the MedHelp forum!
What you have is probably photophobia or increased sensitivity to light. Retinal detachment (this also causes flashes of light), iritis, uveitis, optic neuritis, corneal ulcerations and other afflictions of cornea, and cataracts are a few eye related causes for increased sensitivity to light. It can be due to nervous system disorders like herniation of tonsils or Chiari malformation, meningitis and encephalitis. The latter two you obviously do not have as you do not have nay other symptoms. Chiari malformation can be diagnosed by a MRI of the brain. Other than that it can be a symptom of migraine, retinal migraine, ophthalmic migraine, magnesium deficiency, infectious mononucleosis (if you have a recent history of flu like symptoms), chronic fatigue syndrome, hangover, side effects of certain drugs etc.
Please consult your PCP for primary examination followed by proper referral. You need to consult an eye specialist and a neurologist.
Hope this helps. Please let me know if there is any thing else and do keep me posted. Take care!