A small hand-held electronic machine that is sometimes used to check eye pressure. While not as accurate as other methods, the Tono-Pen is useful for the bedridden and people who can’t get up to the microscope for more traditional pressure measurements.  To use the Tono-Pen, the eye is numbed with anesthetic drops and the device is gently tapped against the front of the cornea. This doesn’t hurt, but feels a little odd. Sterile rubber covers (they look like rubber balloons or miniature condoms) are applied to the Tono-Pen to keep the procedure completely sterile.

Dr. Timothy Root is a practicing ophthalmologist and cataract surgeon in Daytona Beach, Florida. His books, video lectures, and training resources can be found at:


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