. Author manuscript; available in PMC: 2011 Jul 1.

Published in final edited form as: Am J Ophthalmol. 2010 Apr 8;150(1):16–22. doi: 10.1016/j.ajo.2010.01.033

Table 1.

Near stereoacuity values used to define monofixation and bifixation in children with intermittent exotropia when bifixation was defined as at least 40 arc seconds.

Age (years)	Preschool Randot¹¹ (arc seconds)			Titmus¹² (arc seconds)			Frisby¹² (arc seconds)
Age (years)	Bifoveal	Uncertain	Monofixation	Bifoveal	Uncertain	Monofixation	Bifoveal	Uncertain	Monofixation
3	40	60-400	800-nil	40	50-140	200-nil	40	60	70-nil
4	40	60-200	400-nil	40	50-80	100-nil	40		60-nil
5	40	60-200	400-nil	40	50	60-nil	40		60-nil
6	40	60-100	200-nil	40	50	60-nil	40		60-nil
7	40	60	100-nil	40		50-nil	40		60-nil
8-17	40	60	100-nil	40		50-nil	40		60-nil

Monofixation was defined as stereoacuity worse than previously published age-referenced normal thresholds; ¹¹, ¹² ‘uncertain’ indicates stereoacuity values worse than 40 arc seconds but still within normal range for age.