Certified Paraoptometric (CPO) Practice Exam 2025

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Which root word signifies 'light' in medical terminology?

PAPILL
PHOT
RETIN
SCLER

The correct answer is: PHOT

The root word that signifies 'light' in medical terminology is indeed 'PHOT'. This root is derived from the Greek word "phos," which translates to light. It is commonly used in various medical terms related to light, such as "photophobia," which refers to an aversion to light, or "phototherapy," which is a treatment that uses light. The other root words provided do not relate to light. 'PAPILL' pertains to the term related to 'nipple' or 'small body', often used in reference to the optic papilla, where the optic nerve meets the retina. 'RETIN' is derived from the term 'retina,' the light-sensitive layer at the back of the eye, while 'SCLER' refers to the sclera, the white outer coating of the eyeball. These terms are important in ocular and medical discussions but do not have the meaning of 'light'.