When checking the calibration of the Goldman tonometer, the tip should move through which values?

• A. 0, 10, 20
• B. 0, 20, 60
• C. 0, 15, 45
• D. 0, 30, 60

Answer: (B)

Calibration of the Goldman tonometer is about confirming that the applanation tip moves through specific, known positions so the measurement scale remains accurate. The tip should travel from the starting position (0) to an intermediate setting (20) and then to the full-scale setting (60). This three-point check tests both the mechanical travel and the linearity of the response across the instrument’s working range, ensuring the deflection corresponds correctly to the intended readings. If the tip doesn’t reach these points or the movement isn’t smooth, the device may be out of calibration and needs servicing. The other sequences don’t follow the standard three-point calibration check and won’t reliably verify the tonometer’s accuracy.