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  Indian J Med Microbiol
 

Figure 8: Presentation of the lacrimal pump mechanism according to 2 different theories, i.e. Rosengren-Döane (a and c) and Jones (b and d). In the case of Rosengren-Döane, tears are sucked into the canalicular system upon the opening of the eyelids due to the elastic expansion of the lacrimal papillae (a) and expulsed along the nasolacrimal duct upon the closure of the eyelids due to sac compression (c) In the case of Jones' theory, tears are expulsed along the duct upon the opening of the eyelids (b) and are sucked into the sac when the orbicularis oculi contracts (d)

Figure 8: Presentation of the lacrimal pump mechanism according to 2 different theories, i.e. Rosengren-Döane (a and c) and Jones (b and d). In the case of Rosengren-Döane, tears are sucked into the canalicular system upon the opening of the eyelids due to the elastic expansion of the lacrimal papillae (a) and expulsed along the nasolacrimal duct upon the closure of the eyelids due to sac compression (c) In the case of Jones' theory, tears are expulsed along the duct upon the opening of the eyelids (b) and are sucked into the sac when the orbicularis oculi contracts (d)