Intermittent exotropia met the following criteria : ( @ ) IXT at distance OR constant exotropia at distance and either IXT or exophoria at near ; ( @ ) exodeviation ( tropia or phoria ) of at least @ prism diopters ( PD ) at distance or near by prism and alternate cover test ( PACT ) ; and ( @ ) exodeviation of at least @ PD at distance by PACT .