When one pupil is bigger than the other, called anisocoria, it can indicate various conditions ranging from harmless to serious. Normal pupils should be equal in size, typically 2-4mm in bright light and 4-8mm in darkness. Anisocoria affects about 20% of the population and can be physiological (natural variation under 1mm difference) or pathological. Common causes include eye injuries, certain medications, neurological conditions like Horner's syndrome, or brain issues affecting the third cranial nerve. Sudden onset anisocoria, especially with symptoms like severe headache, vision changes, or drooping eyelid, requires immediate medical evaluation as it may signal stroke, aneurysm, or increased brain pressure.
What medications can cause pupils to be different sizes?
Can anisocoria be a sign of a stroke?
Is it normal for pupils to be slightly different sizes?
Learn about this neurological condition that causes pupil size differences, drooping eyelids, and decreased sweating. This guide explains the three types of Horner's syndrome and when to seek medical care.
Discover the warning signs that connect your eyes to your brain health, including pupil changes, vision loss, and eye movement problems. Understanding these symptoms can help you recognize when to seek emergency care.
Explore how trauma to the eye can affect pupil function and overall vision. This article covers immediate treatment steps and potential complications that may develop weeks or months after an injury.
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