| OBJECTIVE: To describe the clinical and histopathologic findings in eyes with hypotony following vitrectomy. DESIGN: Retrospective, clinicopathologic case series. SUBJECTS AND METHODS: The medical records of 4415 patients who underwent vitrectomy between January 1, 1996 and December 31, 2002 were investigated. Low IOP (hypotony) was defined as an IOP of 5mmHg or less. Chronic hypotony based on findings of low IOP at two consecutive or any three postoperative visits. Two enucleated eyes with hypotony were submitted to gross and light-microscopy observations. RESULTS: It is revealed that 4.08% had a chronic hypotony. Logistic regression analyses presented that preoperative IOP, aPVR, history of vitrectomy, history of trauma and silicone oil tamponade were the risk factors for chronic hypotony postoperatively. Postoperative retinal detachment, silicone oil remained and total surgeries were the parameters with the relationship to the chronic hypotony. Histopathologic findings suggested that fibrous proliferation on the ciliary body combined with ciliochoroidal and retinal anatomic structure failure resulted in the chronic hypotony postoperatively. CONCLUSIONS: Chronic hypotony, may occur by one or several risk factors, is not uncommon in eyes that had undergone vitrectomy. The presence of the risk factors should be noticed by surgeons that the eyes are facilitated to be hypotonus. |
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