Which statement about tonometry methods is accurate?

Which statement about tonometry methods is accurate?

• A. Tonoprobe is the only tonometry method mentioned.
• B. Tonopen requires proparacaine.
• C. Tonovet is a contact tonometer.
• D. Proparacaine is not used for any tonometry method.

Answer: (B)

When measuring intraocular pressure with a device that touches the cornea, numbing the surface helps prevent discomfort and reflex movements that can skew the reading. The Tonopen is a handheld device that makes direct contact with the cornea, so using a topical anesthetic like proparacaine is standard to ensure a stable, accurate measurement and to minimize crying or blinking. That’s why the statement about Tonopen requiring proparacaine is accurate and the best choice. Other options aren’t universally true: rebound devices like Tonovet may be used without anesthesia in many cases, and Tonoprobe is one of several tonometry methods rather than the only one mentioned.

When measuring intraocular pressure with a device that touches the cornea, numbing the surface helps prevent discomfort and reflex movements that can skew the reading. The Tonopen is a handheld device that makes direct contact with the cornea, so using a topical anesthetic like proparacaine is standard to ensure a stable, accurate measurement and to minimize crying or blinking. That’s why the statement about Tonopen requiring proparacaine is accurate and the best choice.

Other options aren’t universally true: rebound devices like Tonovet may be used without anesthesia in many cases, and Tonoprobe is one of several tonometry methods rather than the only one mentioned.