Abstract: Procedure for the generation of a reflex tear secretion, which comprises the chemical stimulation of the cornea of the eye of a subject by applying a controlled jet of a gas with a high CO2 content, of at least 80% of CO2. Compact device (1,1?) for the generation of a reflex tear secretion, comprising a gas source (7) in the form of a disposable type cartridge containing a pressurized gas with a composition of at least 80% of CO2; and a pneumatic circuit connecting an outlet mouth of said gas source (7) with a gas outlet nozzle (3) of the device (1,1?), the circuit comprising pressure regulation means (8) and flow rate (17) regulation means suitable for ejecting puffs of gas through the outlet nozzle (3) at a predetermined pressure and flow rates.