Here are the results: Lacrymal sac heigh: 1, 095 0, 036 cm Lacrymal sac width: 0, 455 0, 02 cm Distance from the inferior turbinate to the lacrymal sac: 1, 145 0, 03 cm Distance from the anterior nasal spine to the lacrymal sac: 4, 220 0, 01 cm The anatomical landmarks determination step has been recently performed on 20 patients.