In the dark, the smaller pupil is usually the abnormal pupil. If the damage is due to an underlying condition, such as uveitis or glaucoma, a doctor will develop an individualized treatment plan. The symptoms of tonic pupil often subside with glasses and a prescription for pilocarpine.
The medical term for pupils of different sizes is anisocoria, and doctors categorize this into three further types, depending on the underlying cause.
Many people have very slight differences in the size of their pupils, which is usually not harmful. However, significant size differences or symptoms that come on suddenly can be a sign of dangerous health problems, including a brain aneurysm. If the pupils change suddenly or with other symptoms, such as drooping or other abnormalities, contact a doctor immediately.
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A red spot on the eye is usually a subconjunctival hemorrhage that will heal over time without treatment. It can also be due to diabetes complications. There are many natural ways a person can help protect and improve their eyesight without the need for corrective glasses.
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What Is Anisocoria? Medically reviewed by Elaine K. Luo, M. Symptoms Causes Diagnosis Treatment Prevention Overview Anisocoria is a condition in which the pupil of one eye differs in size from the pupil of the other eye. What symptoms commonly accompany anisocoria? In simple anisocoria, the difference in pupil size is usually 1 millimeter mm or less, and both pupils react normally to light.
The presence of simple anisocoria does not appear to be influenced by sex, age or eye color. The exact cause of simple anisocoria is unknown.
It may be intermittent or constant, and sometimes it goes away on its own. Top: Normal pupils. Middle: Anisocoria with one pupil bigger than normal. Bottom: Anisocoria with one pupil smaller than normal. Pathologic anisocoria is different pupil sizes due to an underlying condition or disease. Examples of conditions that cause anisocoria include:. Iritis is a form of uveitis an inflammatory disease of the eye.
Acute iritis is characterized by:. Iritis has many causes, including eye infection, underlying inflammatory diseases and trauma. Your eye doctor can treat the symptoms of iritis while the underlying cause of the condition is determined and controlled. Horner's syndrome also affects how quickly the smaller pupil dilates in dim lighting.
Normal pupils including normal pupils that are slightly unequal in size dilate within five seconds of room lights being dimmed. A pupil affected by Horner's syndrome generally takes 10 to 20 seconds to dilate in dim lighting or a darkened room. Horner's syndrome typically is caused by an underlying medical problem, such as a stroke, tumor or spinal cord injury.
But in some cases, no cause can be found.
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