Purpose: To evaluate the efficacy and optimum timing for resurgery in case of persistent macular hole (MH). Materials and Methods: Nineteen eyes of 19 patients who underwent fluid air exchange with intravitreal C3F8 for persistent MH after vitrectomy + internal limiting membrane peeling + SF6 were included in the study. Best corrected visual acuity (BCVA). optical coherence tomography... https://www.houseandholders.shop/product-category/shelving-system/