Age between 5 and 18 years
Evidence of IXT on the basis of clinical examination: one eye intermittently drifts outward with minimum alternative exodeviation of 15 prism diopters (PD) in the distance; normal ocular motility
No previous treatment for IXT (including patching, surgery, over-minus lens, vision therapy, and botulinum toxin)
Presence of simultaneous perception and motor fusion documented using synoptophore but abnormal near and distance stereopsis using Titmus test and Randot test (stereoacuity of > 60 arcsec in the Titmus test or > 63 arcsec in the Randot test is defined as “abnormal stereopsis”)
BCVA: 0.7 or better at age of 5 to < 6; 0.8 or better at age ≥ 6
No ongoing or planned amblyopia treatment
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