8-Unequal pupils sizes
Normally, the size of the pupils is the same in both eyes. But some people may find one of their pupils noticeably larger than the other. Formally called anisocoria, unequal pupil sizes is entirely harmless as an isolated condition. Approximately 20 percent of the general population has it, so it’s not even that rare.
If accompanied by other certain symptoms, though, anisocoria can be a sign of health problems that should be taken seriously. For example, Horner’s syndrome is known for causing both droopy eyelids and a smaller pupil in the affected eye. Although Horner’s syndrome isn’t life-threatening, it is sometimes associated with aneurysms or tumors in the neck.
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