Table 1 Baseline characteristics of patients undergoing trabeculectomy (TE) or PRESERFLO (PF) implantation

Number of eyes (n)

104

83

n.a

Age (years)

70.00 ± 12.70

75.69 ± 10.84

0.324

Laterality (right/left)

51/53

37/46

0.545

Sex (female/male)

64/40

44/39

0.242

Ethnicity

 Caucasian/White

102

82

 –

 Hispanic

1

1

 –

 African American

1

0

 –

Baseline IOP (mmHg)

24.09 ± 1.15

21.67 ± 0.77

0.160

Number of IOP-lowering medication

3.25 ± 0.14

3.51 ± 0.14

0.360

Number and types of prior incisional glaucoma surgeries

7 (7 × deep sclerectomy)

11 (4 × TE and 7 × deep sclerectomy)

0.133*

Number of phakic patients

65

57

0.380*

BCVA (logMAR)

0.33 ± 0.03

0.31 ± 0.04

0.547

Visual field mean defect (dB)

 − 11.54 ± 0.93

 − 11.17 ± 1.66

0.892

Mean peripapillary RFNL thickness (µm)

62.79 ± 1.94

62.62 ± 2.05

0.545

Medical glaucoma treatment prior to surgery

 Beta blockers

89

68

0.55*

 Carboanhydrase inhibitors

85

74

0.22*

 Alpha agonists

67

46

0.23*

 Prostaglandins

85

71

0.56*

 Systemic carboanhydrase inhibitors

22

28

0.12*