Objective To evaluate the efficacy of “straight scleral tunnel incision”-trabeculectomy with a releasable suture supplemented with mitomycin C （MMC） on reducing intraocular pressure （IOP）

complications

and corneal astigmatism in patients with primary angle-closure glaucoma （PACG）. Methods Totally 217 acute or chronic PACG patients with occludable angle above 180° and IOP above 21mmHg were divided into 3 groups. Patients in group A （98 cases

128 eyes）

B （71 cases

95 eyes）

and C （48 cases

60 eyes） were treated with “straight scleral tunnel incision”-trabeculectomy with a releasable suture supplemented with MMC

releasable suture trabeculectomy with MMC

and trabeculectomy with MMC

respectively. IOP

complications

and surgically induced astigmatism （SIA） were evaluated preoperatively and up to 12 months postoperatively. [JP+2]Results IOP of 2 weeks after treatment was significantly lower than preoperative IOP in all the 3 groups （all P<0.001）. Success rates （IOP≤20 mmHg） in group A

B

and C were 87.91%

89.23%

and 83.72% respectively at 12 months after treatment （P=0.256）. The incidence of shallow anterior chamber and hypotony had no significant difference between group A and B

but both of them were lower than that in group C （P<0.05）. There were no significant differences in preoperative corneal astigmatism among the 3 groups. The corneal astigmatism after 2 weeks in group A （1.71±1.47D） was higher than that before operation （1.28±1.05D

P=0.126）. With 12 months gone

the astigmatism almost returned to preoperative levels. The corneal astigmatisms after 2 weeks in group B and C （1.99±1.20D and 2.22±1.39D） were significantly higher than those before operation （1.20±0.85D and 1.18±0.93D

P=0.002

P=0.001）

respectively. With 12 months gone

the mean astigmatisms in group B and C （1.87±0.91D and 1.90±1.16D） were still significantly higher than those before operation （ P=0.001

P=0.003）. The highest astigmatic polar values in group A

B

and C （1.00D

1.89D

and 1.77D） occurred after 2 weeks

1 month

and 1 month postoperation

respectively

which were significantly higher than those before operation （0.19±1.32D

0.12±1.22D

and 0.17±1.25D

P<0.01）

respectively. With 12 months gone

they were 0.03D

-0.18D

and -0.13D higher than those before operation

respectively. The rates of function bleb and thin-wall bleb were 71.43% and 26.37% in group A

75.38% and 29.23% in group B

72.09% and 25.58% in group C

respectively at 12 months after treatment. There were no significant differences among the 3 groups.