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What area does the tonometer tip flatten upon applanation on the cornea?
5.25 sq mm
6.75 sq mm
7.35 sq mm
8.25 sq mm
The correct answer is: 7.35 sq mm
The tonometer tip flattens an area of approximately 7.35 square millimeters on the cornea during applanation. This measurement is critical because applanation tonometry is a common method used in ophthalmology to assess intraocular pressure (IOP). The concept relies on the principle that the pressure in the eye under a small, standardized area is related to the amount of force necessary to flatten that area. In this procedure, the tonometer tip's size and shape are standardized to provide consistent readings. The choice of 7.35 square millimeters is based on research and calibration, ensuring that the pressure readings correlate accurately to the actual IOP in the eye. Understanding this specific area allows ophthalmic technicians and clinicians to utilize the tonometer effectively, ensuring that their assessments of IOP are both reliable and valid for diagnosing and managing conditions such as glaucoma.