Prevalence of Heterophoria in Tibetan Grade-One Students: The Lhasa Childhood Eye Study

Table 6

Proportion of children with/without fine stereoacuity (≤60 seconds of arc) in heterophoric and orthophoric children for grade-one pupils at near and distance fixation in Lhasa, Tibet Autonomous Region, China.

		Poor stereoacuity (n, %)	Fine stereoacuity (n, %)	χ^2	value
Distance	Heterophoria	17 (19.77)	69 (80.23)	0.017	0.897
	Orthophoria	324 (19.21)	1363 (80.79)
Near	Heterophoria	97 (23.26)	320 (76.74)	5.70	0.017
	Orthophoria	244 (17.99)	1112 (82.01)

Poor stereoacuity: >60 seconds of arc. Fine stereoacuity: ≤60 seconds of arc.