When that happens, sometimes it's just an abnormality. In other times, it can be a sign of infection, tumour growth or stroke. Sometimes the nerves in the brain are involved, in other times, the ciliary ganglion is involved.
In 30-40 years old females, sometimes one pupil can be slower in reaction to light.It may look like it is larger in resting state as well. It could be affected by reduced tendon reflexes.
The pupils are small. Normally the pupil get smaller when they look at a near object. However, in Argyll Robertson pupil, it does not react to near object. They could be caused by diabetes or by infection.
In this cases, there is a triad of three abnormalities. Ptosis (droopy lid), Miosis (smaller pupil), anhydrosis (decrease in sweat gland function). It's caused by a disruption of the sympathetic nerve leading to the affected eye. It can include the pre-ganglionic nerve, or post-ganglion nerve. It can be due to infections, multiple sclerosis, lung tumour, internal carotid interruption, and cerebral-vascular accidents.
If you see your friend having unusual pupils, it's always best to get the eyes check to rule out trauma, infection, growth or stroke.
Dr. Yan L. Liang, OD
Contact Warden Optometry to book your appointment today.