Why Do Pupils Dilate?
Disease description:
This morning, I discussed with a colleague why human pupils dilate, but we couldn’t determine the underlying cause. Could you please explain why pupils dilate?
Doctor's answer (1)
Dr. Wang Shengqiang
There are numerous causes of pupil dilation. For instance, if a patient has been in a dimly lit environment for an extended period and is then suddenly exposed to bright light, their pupils may dilate. Pupil dilation can also result from certain medications—for example, some anti-fatigue eye drops. Additionally, patients with glaucoma may experience pupil dilation.
