Table 2.

Definition of recurrence of pterygium in the enrolled studies.

References	Definition of recurrence
Razeghinejad et al. (21)	Fibrovascular tissue extending more than 1.5 mm across limbus
Shenasi et al. (26)	Fibrovascular growth crossing limbus and extending over the cornea to any distance
Shahin et al. (20)	4 grades classified
Xu et al. (38)	Fibrovascular tissue invading cornea
Nava-Castaneda, A et al. (23)	4 grades classified
Karalezli et al. (17)	Fibrovascular growth passing the corneal limbus by more than 1 mm
Razeghinejad et al. (25)	More than 1.5 mm of fibrovascular tissue overgrowth on cornea and any fibrovascular tissue crossing limbus
Ozsutcu et al. (24)	Any fibrovascular growth of conjunctival tissue extending more than 1.5 mm across limbus
Kasetsuwan et al. (22)	4 grades classified
Singh et al. (14)	4 grades classified
Bekibele et al. (12)	Growth of fibrovascular tissue 1 mm or more into cornea
Motarjemizadeh et al. (13)	New vessels or fibrovascular connective tissues crossing corneal limbus
Nuzzi et al. (19)	Growth of fibrovascular tissue extending more than 1 mm across the limbus
Mohamed et al. (18)	No definition
Zhang et al. (36)	4 grades classified