Which instrument is used to noninvasively measure intraocular pressure?

Which instrument is used to noninvasively measure intraocular pressure?

• A. Stethoscope
• B. Phoropter
• C. A Tonometer (e.g., Applanation Tonometer or iCare)
• D. Keratometer

Answer: (C)

Measuring intraocular pressure noninvasively is done with a tonometer. This instrument estimates the pressure inside the eye by assessing how the cornea responds to a controlled interaction, typically by flattening a small area of the cornea (applanation tonometry) or by observing the corneal response to a short probe or an air puff (rebound or noncontact tonometry). It provides an IOP reading without any surgical procedure. Common examples include the applanation method used with a slit lamp and handheld devices like the iCare. Other tools listed are used for different purposes: a stethoscope listens to heart and lung sounds, a phoropter refines refractive error, and a keratometer measures corneal curvature. The tonometer is specifically designed to gauge intraocular pressure noninvasively, making it the correct instrument for this purpose.

Measuring intraocular pressure noninvasively is done with a tonometer. This instrument estimates the pressure inside the eye by assessing how the cornea responds to a controlled interaction, typically by flattening a small area of the cornea (applanation tonometry) or by observing the corneal response to a short probe or an air puff (rebound or noncontact tonometry). It provides an IOP reading without any surgical procedure.

Common examples include the applanation method used with a slit lamp and handheld devices like the iCare. Other tools listed are used for different purposes: a stethoscope listens to heart and lung sounds, a phoropter refines refractive error, and a keratometer measures corneal curvature. The tonometer is specifically designed to gauge intraocular pressure noninvasively, making it the correct instrument for this purpose.