Table 3.

Description of studies included in the narrative review.

No	Authors	Year	Study design	Surgical procedure	Outcome assessed
1	Gulati et al.	2004	RCT	Ophthalmic pediatrics	There was no significant change in mean intraocular pressure after insertion of the LMA. However, in the endotracheal tube group, the mean intraocular pressure significantly increased from a baseline of 13.1 ± 4.0 mmHg to 19.9 ± 7.3 mmHg.
2	Myint et al.	1995	RCT	Ophthalmic adult	Intraocular pressures were lower than baseline in both groups throughout anesthesia. But one min after removal of the device, mean intraocular pressure in the tracheal tube group was 16.0 mmHg and was significantly higher than the laryngeal mask group (10.9) (p < 0.01).
3	Ziyaeifard et al.	2012	RCT	Ophthalmic adult	There were no significant differences in IOP between LMA and ETT groups immediately after airway instrumentation except in 5th min when IOP was 7.9 ± 2.3 mmHg in LMA and 9.4 ± 2.5 mmHg in the ETT group; (p = 0.030).
4	Holder et al.	1991	RCT	Ophthalmic adult	Mean IOP before airway instrumentation in LMA and ETT groups was 17.9 ± 3.8 and 18.±4.1. However, after airway instrumentation, mean changes in LMA was 1.8 ± 21 and 6.8 ± 5.5 in the LMA group.
5	Ghai et al.	2001	RCT	Ophthalmic adult	IOP was measured in both right and left eyes. Both groups were associated with significant intraocular pressor responses after airway instrumentation in both eyes; however, the mean maximum increase was significantly higher after tracheal intubation.