<prompt> Which procedure is being done in the patient?Applanation tonometryA scan ultrasonographyIndentation tonometryKeratometry  <response>: Ans. c Indentation tonometryRef: Parsons 22e. p. 126The instrument in the image is a Schiotz tonometer - which is based on principle of Indentation tonometry - a plunger will indent and thus displace aqueous to raise IOP more in a soft eye than a hard eye. 