. 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 2.

Near stereoacuity values used to define monofixation and bifixation in children with intermittent exotropia when bifixation was defined as at least 60 arc seconds.

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

Monofixation was defined as stereoacuity worse than previously published age-referenced normal thresholds; ¹¹, ¹² ‘uncertain’ indicates stereoacuity values worse than 60 arc seconds but still within normal range for age.