pupil changing size

Hi, when i am tired or i am in a dimly lit room and its late at night, my left eye changes size, so my right eye is about twice the size, why is this i have no idea about it, ive had it all my life and have been to optitions and know one knows why, is it a lazy light receptor thats enhanced when i am tired?

[John C Hagan III, MD, FACS, FAAO]

If you have had it all your life and it hasn't changed it's called "physiologic ansicoria" and it probably comes from differential enervation of the pupil sizing mechanism. There is no good treatment.

JCH MD

[ash_3465]

i have just recently noticed that in dim light my right piupil is noticably smaller then my left one , but two days ago it was the left eye pupil that was smaller then my right i have mirgain headaches and frequent regular ones whats going on ?

[John C Hagan III, MD, FACS, FAAO]

You need to see an ophthalmologist, it is critical you not let the staff put in ANY DROPS until the eye MD looks at your pupils. Also take in 3 or 4 good quality facial pictures (good enough to easily see the pupils) taken over the last 20 years  Find an Eye MD at www.aao.org in the USA elswhere ask your family GP for a referral.

JCH MD