Final answer:
Tonometry measures intraocular pressure, not the movement of the eardrum, which vibrates in response to sound waves.
Step-by-step explanation:
The statement that tonometry measures the movement of the eardrum is false. Tonometry is actually used to measure the intraocular pressure (IOP) within the eye, which is critical for diagnosing and managing conditions like glaucoma. The movement of the eardrum, on the other hand, is associated with the perception of sound. Sound waves entering the ear canal cause the eardrum to vibrate; these vibrations are then converted into nerve impulses that the brain interprets as sound.