Advantages:

• anterior lamellae can be reconstructed with less contracture during healing
• a viable vascular supply at the base of the flap increased the viability of the tissue compared with skin graft

• advancement flaps (tissue moves directly forward into a defect)
• rotation 
• transposition flaps (in rotation flap, the flaps rotate about a pivot point whereras in transposition flap the flap is moved lateratlly to cover a defect; in practice both techniques are combined to a certain degrees. Therefore a flap tends to be called by its name rather than the principle which predominates for example V-Y plasty or O-Z plasty)

Useful flap techniques:
 

Rounded defect in the lower lid.	An O-Z plasty (a double rotational flap) is useful for closing the defect with minimal  scar.
Defect in the lower/upper lids can be corrected with advancement flaps. The two triangle at the base reduces dog ear deformity.	The dog ears at the base of the flaps  can be corrected using the Burrow's  triangle to allow smooth closure.
Lesion in the medial canthus	V-Y plasty brings the tissue down  to cover the defects
Lesion in the lower lid involving the  lateral canthus	Transposition flap using the upper lid skin to cover the lower lid defect. The reverse is not recommended as closure of  the lower lid defect can lead to ectropion.