What is the diameter of the contact area of the applanation tonometer?

The diameter of the contact area of the applanation tonometer is significant because it directly affects the accuracy and reliability of intraocular pressure measurements. The applanation tonometer works on the principle of flattening the cornea to measure the pressure inside the eye. The specific diameter of 3.06 mm is standardized for this device, which allows for consistent measurements that minimize variability. This diameter has been determined through clinical studies to provide the best correlation with the actual intraocular pressure.

This choice stands out as the correct answer because it is based on scientific research and design specifications of the tonometer, reinforcing its efficacy in clinical settings. Understanding the dimensions of the applanation tonometer is vital for healthcare practitioners as it informs them about proper techniques and expected outcomes in their assessments of ocular pressure.