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A 36-year-old member asked:

What is the device that looks like a pencil used to test for glaucoma?

1 doctor answer2 doctors weighed in
Dr. Sandra Lora Cremers
Ophthalmology 26 years experience
Tonopen: The tonopen is a device that looks like a big pencil. It measures the pressure in the eye similar to standard applanation though not as accurate.

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Last updated Oct 25, 2013

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