A clinical procedure for linear measurement at the vocal fold level

Summary The relatively narrow depth of field and long focal distance of the microscope are the basic facts on which the procedure is founded. To the microscope a videocamera is connected. As long as the adjustments of the microscope are unchanged and your recordings are made in focus you can compare sizes and determine the magnification factor and thus obtain real sizes. The maximal error of measurement is calculated: 4.65 ± 3.10%.