A patient has a tonometer test result of 28 mmHg. Which explanation by the nurse about this pressure reading is most accurate?
1. The pressure in the eye has been measured and is too low. Medication will be required to increase the pressure and prevent blindness from retinal damage.
2. The pressure in the inner ear has been measured to evaluate the semicircular canals' function related to nerve damage and is within the normal range.
3. The pressure in the middle ear that builds up with mastoiditis has been measured. The condition needs to be treated with surgical insertion of tubes to drain the fluid behind the tympanic membrane.
4. The pressure in the eye has been measured and is above normal. This condition could lead to possible retinal changes if not treated.
Correct Answer: 4
Tonometry is used to diagnose increased intraocular pressure in glaucoma. A handheld tonometer or computerized device may be used. The cornea is anesthetized prior to being touched with the device. The normal range is 10–22 mmHg. A tonometer measures eye pressure, not ear pressure. Typanometry is performed to evaluate the response of the tympanic membrane to changes in air pressure and middle ear function.
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