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Purpose. To evaluate relationships between the incidence of re-detachment and post-operative days of hospitalization in patients with diagnosis of retinal detachment (RD) who underwent surgery either through ab-externo approach (scleral buckling and encir-cling) or ab-interno approach (vitrectomy and oil-gas tamponade). Methods. This retrospective study included 268 patients (268 eyes) with diagnosis of primary RD: 127 males (47%) and 141 (53%) females, mean age of 64.1 ± 17.3 years. 46 patients (17%) underwent a surgical ab-externo approach (group A), while 222 patients (83%) underwent an ab-interno surgical approach. Each RD was graded according to the “Retinal detachment grading system of Royal College of Ophthalmologists ” and treated within 5 days after diagnosis. The redetachment (RT) related to a surgical failure was considered within 30 days after first operation. Results. In the group 1 without night hospitalization (day surgery) global RT rate was 3.5 % (4.17 % for ab-interno technique and 0 % for ab-externo techniques). In the group 2 with one day of hospitalization global RT rate was 1.33 % (1.49 % for ab-interno tech