Anisocoria / Different Size Pupils (Adult)
Unequal Size Pupils
"Anisocoria" is the medical term for unequal pupil sizes. In a few people, this could be just normal for them and not of any concern, though in these cases the difference in size is usually relatively small. Other possible causes of anisocoria nclude birth trauma to the neck or medications that can dilate the pupils.
A new onset of different sized pupils in adults also warrants an eye exam as it can be a sign of neurologic issues or even a type of lung cancer in patients who are smokers.