Table 1.

Summary of main studies characteristics.

Study	Type of Study	Prospective/retrospective	Subjects
Kohnen et al. [10]	NRCT	Prospective	Group hybrid: 14 Group μ-monovision: 15
Leray et al. [11]	NRCT	Prospective	76
Avila and Vivas [14]	Case Series	¿?	15
Rahmania et al. [12]	Case Series	Prospective	28
Boucenna et al. [13]	Case Series	Retrospective	23
Fu et al. [17]	Case Series	Prospective	18
Fu et al. [18]	Case Series	Prospective	22
Ganesh et al. [15]	Case Series	Retrospective	101
Liu et al. [16]	Case Series	Prospective	37
Luger et al. [19]	Case Series	Retrospective	19
Villanueva et al. [20]	Case Series	Retrospective	12
Chan et al. [22]	Case Series	Retrospective	36
Pajic et al. [21]	Case Series	Prospective	36
Courtin et al. [24]	Case Series	Prospective	65
Vastardis et al. [23]	Case Series	¿?	19
Wang et al. [25]	Case Series	Prospective	69
Luger et al. [28]	Case Series	Retrospective	32
Saib et al. [26]	Case Series	Retrospective	37
Soler et al. [27]	Case Series	Prospective	Group symmetrical: 16 Group asymmetrical: 14
Gifford et al. [29]	Case Series	Retrospective	31
Baudu et al. [31]	Case Series	Retrospective	358
Luger et al. [30]	Case Series	¿?	33
Uthoff et al. [32]	Case Series	Prospective	30