<prompt> Which of the following is not a source of error in the applanation tonometry:High Pressure on the globeTear filmAstigmatismWide pulse pressure  <response>: Tear film is required for accurate measurement , is not a source of error. Sources of error in tonometry: Inappropriate fluorescein pattern. Pressure on the globe. Central Corneal thickness. Corneal edema. Pulse pressure. Astigmatism. Incorrect calibration. Wide pulse pressure. 