Certified Paraoptometric (CPO) Practice Exam 2025

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What does the suffix 'TON' relate to in medical terminology?

Disease
Pressure
Light
Sclera

The correct answer is: Pressure

The suffix 'TON' in medical terminology is indeed associated with the concept of pressure. It is commonly found in terms related to pressure within the body, such as "tonometry," which is a measurement of intraocular pressure in the eye. This connection to pressure makes it clear why 'TON' is accurately linked to the measurement and evaluation of tensions and pressures in various physiological contexts. The other options do not align with the definition of the suffix 'TON.' For example, 'disease' would typically be associated with different prefixes and suffixes that signify disorders or conditions. Similarly, 'light' and 'sclera' pertain to visual descriptors or components of the eye but do not relate to pressure measurement in medical terminology.