A Patient Has Tonometer Test Results of 28 MmHg

A patient has tonometer test results of 28 mmHg. Which explanation by the nurse of tonometer pressure readings is most accurate?

A) The pressure in the posterior chamber of the eye is measured, which is too low and requires medication to increase the pressure to prevent blindness from retinal damage.
B) The pressure in the inner ear is measured to evaluate the semicircular canals functions related to nerve damage, and is within the normal range.
C) The pressure in the middle ear that builds up with mastoiditis is measured and needs to be treated with surgical insertion of tubes to drain the fluid behind the tympanic membrane.
D) The pressure in the anterior chamber of the eye is measured and could lead to possible retinal changes due to above-normal pressures if not treated.