Introduccion: Pneumotonometers are handy equipments for testing intraocular pressures (IOP) both for physicians and patients and doesn’t transmit infectious illnesses, but are also known to have a less stable estimation of the IOP values comparing to the conventional Goldmann applanation tonometer. Objective: In this study, we try to define the range of variability Introduccion: Pneumotonometers are handy equipments for testing intraocular pressures (IOP) both for physicians and patients and does not transmit infectious illnesses, but are also known to have less stable estimation of the IOP values ​​comparing to the conventional Goldmann applanation tonometer. Objective: In this study, we try to define the range of variability