Plural of eyestone; multiple smooth objects used to clean or treat the eyes.
From 'eye' + 'stone' (plural -s). The plural of the folk medicine term for objects inserted in the eye to remove irritants.
Eyestones are mostly forgotten now, but they were popular enough to appear in medical textbooks well into the 20th century—a reminder that 'old remedies' aren't always wrong, just sometimes inconvenient compared to modern alternatives.
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