There  is no clear answer to this question but several studies have shown that  there is a link between migraine and dry eyes.

The goal of one study was to observe the tear film functions of migraine patients. Sixty-six  participants were chosen. Half of them suffered from migraine and the  other half were control patients who did not have migraine nor  headaches. All participants went through several ophthalmic tests such  as Schirmer’s test and tear break-up time. The results showed  significant differences between the patients with migraine and the  control group. It was concluded that those suffering from migraine are  more prone to the dry eye syndrome.

It was also discovered that  migraine gets worse if the patient also suffers from dry eyes. The headaches caused by migraine can be correlated with the eye condition.

Another  study with significant results was conducted in 2015. There were 49  participants, 19 migraine patients and 30 control patients. The conclusion was that migraine patients have a reduced corneal nerve fiber density. Corneal modifications can cause migraine as well as the dry eyes feeling. It was also found that dry eye syndrome affects the trigeminal network that has a critical part in migraine. Migraine patients may experience dry eye symptoms without having dry eye syndrome.

The studies found a correlation between dry eyes and migraine but more research is needed to study the causality between the two conditions. It is also not known if treating a condition will improve the other.

People who are diagnosed with migraine are advised to have an  eye check-up if they start experiencing dry eye symptoms.