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Tonopen

The Tono-Pen is a handheld device that's shaped like a large marker.
A doctor can touch this device to your eye to measure the pressure.
Pressure in the eyes greater than 22 [mm Hg] is considered higher than normal and can indicate ocular hypertension.
While ocular hypertension is not an eye disease in itself, it is an indication that you could develop glaucoma.

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