Background: The encapsulation of the bleb or so-called (Tenon cyst) around the device can compromise valve function, increasing intraocular pressure and thus requiring additional surgical procedures.Objective: To describe the efficacy and safety of encapsulated cyst resection in Ahmed valve implant for the control of intraocular pressure.Study design: Observational study, retrospective cases series.Method: An analysis was made of the patients who underwent encapsulated cyst resection between January 2016 and August 2017 with a 6-month follow-up, patients with a history of cyclodestructive procedure, visual acuity of no light perception, altered state of consciousness, combined surgery and / or postoperative follow-up of less than 3 months were excluded.Results: 14 eyes were analyzed, of which 9 (64.3%) were women. The average age was 56.1 with a range between 14 - 83 years. he average preoperative intraocular pressure was 26.7 ± 6.6 mmHg with a statistically significant reduction from the first postoperative day 9.8 ± 0.93 mmHg and at the sixth month 13.7 ± 0.94 mmHg (p 0.005). In the first postoperative month there was a significant reduction in the number of hypotensive drugs (p 0.003), which stabilized at the third month and at the sixth month did not present a statistically significant difference (p 0.078).Conclusion: Encapsulated cyst resection is an effective procedure to achieve control of intraocular pressure in patients with refractory and / or uncontrolled glaucoma with few associated complications.