A member asked:

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

A doctor has provided 1 answer
Dr. Sandra Lora Cremers answered

Specializes in Ophthalmology

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.

Answered 10/25/2013

4.8k views

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