Dilated pupil In a case where one pupil refuses to make a response to the dilating drops, there could be a number of possibilities. You might have a serious eye, brain, or neck injury that requires emergency treatment. The most common causes of one pupil being larger than the other include: 1.
The pupil also contracts when the eye changes focus from far away to close up. If you experienced a head injury before your pupils changed in size, contact 911 or go to the hospital immediately. Anisocoria is the medical term that simply means the pupils are not equal. For example, be sure to mention if you’ve recently experienced:ĭepending on your symptoms and medical history, your doctor might order one or more tests to help diagnose the underlying cause of your anisocoria. You should also discuss any other symptoms you’ve been experiencing. Does one pupil look noticeably larger or smaller than the other If so, you may have anisocoria. A pupil affected by Horner's syndrome generally takes 10 to 20 seconds to dilate in dim lighting or a darkened room. Schedule an exam Find Eye Doctor Look at your eyes carefully in a mirror. Pathologic anisocoria reflects an abnormality in the. Normal pupils (including normal pupils that are slightly unequal in size) dilate within five seconds of room lights being dimmed. The larger pupil allows more light in the eye, which can be uncomfortable but not harmful. If you don’t already have a provider, our Healthline FindCare tool can help you connect to physicians in your area.ĭuring your appointment, your doctor will examine your eyes and have your vital signs taken. Unequal pupil size, which may represent a benign physiologic variant or a manifestation of disease. People with naturally large pupils are prone to light sensitivity. If you notice a difference in size between your pupils, contact your doctor right away. How will your doctor diagnose the cause of anisocoria?
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