Pupil dilation can also be caused by marijuana use. The most common drugs that can cause pupil dilation are antihistamines, antidepressants, antipsychotics, and some heart medications. Pupil dilation is a common side effect of many medications. The pupillary reflex is just one way that your body helps to protect your eyesight. When your pupils dilate, they let in more light, which can help you see better in low-light conditions.Ĭ onversely, when your pupils constrict, they reduce the amount of light that enters your eyes, which can help to prevent damage from bright light. The pupillary reflex is important because it helps to protect your eyes from sudden changes in light intensity. This reflex is controlled by the autonomic nervous system, which means that it happens automatically and does not require you to think about it. The process by which your pupils adjust to changes in lighting conditions is known as the pupillary reflex. These includes: A change in lighting conditions. There are many reasons why your pupils may dilate. Read also: What Happens When Your Oxygen Level Drops Too Low What Causes Pupils to Dilate? It can, however, be a symptom of an underlying health condition that needs treatment.
Most of the time, mydriasis is benign and not something you should worry about. Pupils may dilate without any change in illumination from time to time. Your pupils, or openings through which light enters your eye so you can see, are those dark circles. You look in the mirror and see that your dark circles are larger than usual in the center of your eyes.
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