To measure the amount of ocular deviation in strabismus patients with an eye-tracking virtual reality headset

BMC Ophthalmology

Table 2 The extent of concordance between the APCT and VR for measurement of the strabismic angle

	VR-APCT (PD)^a	P value	ICC (95%CI)	95% Limits of agreement (PD)
Total (n = 38)	0.88 ± 5.77	0.352	0.897 (0.810–0.945)	11.32
Subgroup analysis 1
XT (n = 16)	−3.01 ± 5.75	< 0.001^b	0.862 (0.651–0.950)	11.27
ET (n = 18)	4.65 ± 3.38	< 0.001^b	0.962 (0.902–0.986)	6.62
Subgroup analysis 2
Comitant (n = 21)	1.16 ± 6.32	0.746	0.864 (0.695–0.943)	12.39
Incomitant (n = 17)	0.54 ± 5.19	0.746	0.890 (0.724–0.959)	10.17

VR virtual reality, APCT alternative prism cover test, ICC intra-class correlation coefficient, XT exotropia, ET esotropia, PD prism diopter
^aData are mean ± standard deviation
^bStatistically significant by the independent Samples t test among XT and ET subgroups

ISSN: 1471-2415