Primary outcome: difference of microperimetry retinal sensitivity after primary vitrectomy for idiopathic full thickness macular holes with inverted flap technique versus internal limiting membrane (ILM) peeling technique Secondary outcomes: difference of visual change after primary vitrectomy for idiopathic full thickness macular holes with inverted flap technique versus internal limiting membrane (ILM) peeling technique; difference in closure rate after primary vitrectomy for idiopathic full thickness macular holes with inverted flap technique versus internal limiting membrane (ILM) peeling technique

Inclusion Criteria:

• >18 years old
• idiopathic full thickness macular hole ≤ 350 micron of diameter
• phakic or pseudophakic
• absence of systemic adverse conditions

Exclusion Criteria:

• concomitant retinal and other ocular disease
• previous ocular surgery except cataract surgery
• axial length >26mm